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Lifespan, longevity, and ageing

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"Maximum longevity: 65.5 years (captivity) Observations: Elephants are long-lived mammals but suffer from teeth erosion as a type of mechanical senescence despite having as much as six sets of molars in a lifetime. Although both sexes may become sexually mature at about 9 years of age, males do not normally reproduce until they are about 15 years old. Full size is attained at about 17 years of age (Ronald Nowak 1999). There is much speculation and anecdotes about the longevity of elephants with reports of animals living more than 80 years. In particular, it has been reported that a male elephant called "Lin Wang" died at the age of 86 in Taipei Zoo (Wiese and Willis 2004). This record is unconfirmed, however, because the animal was estimated to be 26 when it was obtained, which is impossible to verify. Other reports of animals living over 70 years are plausible but have not yet been verified. Therefore, the oldest elephant on record was probably a wild born female that was about 65-66 years when she died in captivity (Richard Weigl 2005)."
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Associations

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When a potential predator such as a lion or tiger threatens a calf, the adults form a defensive circle with the calf in the middle. Adult elephants are probably not susceptible to predation by any species other than humans.

Known Predators:

  • tigers (Panthera tigris)
  • Asiatic lions (Panthera leo persica)
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Ciszek, D. 1999. "Elephas maximus" (On-line), Animal Diversity Web. Accessed April 27, 2013 at http://animaldiversity.ummz.umich.edu/site/accounts/information/Elephas_maximus.html
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Morphology

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Head and body length is 550 to 640 cm and shoulder height is 250 to 300 cm. The skin is thick and dry, and the few hairs are stiff. Skin color varies from grey to brown. In contrast to African elephants, Asian elephants have ears that are much smaller, the back is not as sloping, the head rather than the shoulders is the highest part of the body, the trunk has a single finger-like projection rather than two, and the hind foot has 4 nails rather than 3. The cylindrical feet consist of reduced phalanges resting on a pad of elastic tissue. The cerebral hemisphere is quite convoluted, resembling that of humans and dolphins. The elephant's teeth are unique. They have a limited number of very large teeth that move forward in the mouth as the animal ages; as the front teeth are worn away with use they are replaced from behind. If an elephant lives long enough to have used up all of its teeth it then starves to death. In males, a pair of incisors is elongated (growing 17 cm per year throughout the animal's life) into tusks. Unlike African elephant females, Asian females do not bear tusks.

Range mass: 3000 to 5000 kg.

Range length: 550 to 640 cm.

Other Physical Features: endothermic ; homoiothermic; bilateral symmetry

Sexual Dimorphism: male larger; ornamentation

Average basal metabolic rate: 2336.5 W.

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Ciszek, D. 1999. "Elephas maximus" (On-line), Animal Diversity Web. Accessed April 27, 2013 at http://animaldiversity.ummz.umich.edu/site/accounts/information/Elephas_maximus.html
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Deborah Ciszek, University of Michigan-Ann Arbor
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Life Expectancy

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The lifespan of Asian elephants is about 70 years.

Average lifespan
Status: wild:
70 years.

Average lifespan
Status: wild:
78.0 years.

Average lifespan
Status: wild:
70.0 years.

Average lifespan
Status: wild:
40.0 years.

Average lifespan
Status: captivity:
69.0 years.

Average lifespan
Status: wild:
60.0 years.

Average lifespan
Status: captivity:
80.0 years.

Average lifespan
Status: captivity:
77.0 years.

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Ciszek, D. 1999. "Elephas maximus" (On-line), Animal Diversity Web. Accessed April 27, 2013 at http://animaldiversity.ummz.umich.edu/site/accounts/information/Elephas_maximus.html
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Habitat

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Asian elephants mainly use scrub forest, although their habitat can vary. They can be found in the jungle, but generally on the edge where open, grassy areas are accessible. They prefer areas that combine grass, low woody plants, and forest. Elephants rarely forage in one area for more than a few days in a row.

Habitat Regions: tropical ; terrestrial

Terrestrial Biomes: savanna or grassland ; forest ; scrub forest

Other Habitat Features: agricultural

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Ciszek, D. 1999. "Elephas maximus" (On-line), Animal Diversity Web. Accessed April 27, 2013 at http://animaldiversity.ummz.umich.edu/site/accounts/information/Elephas_maximus.html
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Distribution

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Parts of India and Southeast Asia, including Sumatra and Borneo. Asian elephants were formerly widely distributed south of the Himalayas, throughout Southeast Asia, and in China as far north as the Yangtze River.

Biogeographic Regions: oriental (Native )

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Ciszek, D. 1999. "Elephas maximus" (On-line), Animal Diversity Web. Accessed April 27, 2013 at http://animaldiversity.ummz.umich.edu/site/accounts/information/Elephas_maximus.html
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Trophic Strategy

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These elephants eat a wide variety of species of vegetation. They prefer grasses, but they also consume bark, roots, leaves, and stems of trees, vines, and shrubs. Most of an adult's activities involve moving toward and eating food. They eat in the morning, evening, and night but rest during the hottest part of the day. An average day's intake is 150 kg of vegetation, of which only about 44% is actually digested (with the aid of symbiotic gut bacteria). Elephants eat long grasses by plucking a "handful" with their trunk and putting the bundle in their mouth. To eat short grasses, they kick up a pile of dirt with their feet and sweep the grass into their mouth, again with the end of their trunk. Shrubs are eaten by breaking off twigs with the trunk and inserting them into the mouth. To eat the bark off larger branches, they hold the branch with their trunk and rotate it while scraping off the bark with their teeth - similar to the way people eat corn on the cob. Elephants also drink at least once a day (140 liters of water may be consumed in just one day) and so are never very far from a water supply.

Plant Foods: leaves; roots and tubers; wood, bark, or stems

Primary Diet: herbivore (Folivore , Lignivore)

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Ciszek, D. 1999. "Elephas maximus" (On-line), Animal Diversity Web. Accessed April 27, 2013 at http://animaldiversity.ummz.umich.edu/site/accounts/information/Elephas_maximus.html
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Deborah Ciszek, University of Michigan-Ann Arbor
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Benefits

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Asian elephants have been domesticated for centuries. Individuals can be trained to reliably perform a wide variety of tasks. They are used as draft animals, for hunting, and for transportation. Ivory from their tusks is used in the manufacture of a number of items, including jewelry.

Positive Impacts: body parts are source of valuable material; ecotourism

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Ciszek, D. 1999. "Elephas maximus" (On-line), Animal Diversity Web. Accessed April 27, 2013 at http://animaldiversity.ummz.umich.edu/site/accounts/information/Elephas_maximus.html
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Deborah Ciszek, University of Michigan-Ann Arbor
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Behavior

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Elephants use their tusks for a variety of purposes: to dig for water, remove bark from trees, maneuver fallen trees and branches, mark trees, rest their trunk on, fight with, and, in domestic animals, for various kinds of work. Elephants are left or right tusked, just as humans are left or right handed. Their trunks, which are formed by the combination of the elongated nose and upper lip, are also very useful. At the tip is a single, finger-like extension that is very sensitive and can be used for precise manipulation of objects. Trunks are used in eating, drinking, smelling and breathing, touching, vocalizing, washing, dusting (throwing dirt onto the back, possibly as a way of deterring insects), and fighting. The senses of touch and hearing are acute, but eyesight is somewhat poor. Young elephants follow their mothers or older sisters by holding on to their tails. When in danger, elephants run with their tails held up, which may signal the danger to the other members of the herd.

Communication Channels: tactile ; acoustic ; chemical

Other Communication Modes: pheromones ; vibrations

Perception Channels: visual ; tactile ; acoustic ; vibrations ; chemical

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Ciszek, D. 1999. "Elephas maximus" (On-line), Animal Diversity Web. Accessed April 27, 2013 at http://animaldiversity.ummz.umich.edu/site/accounts/information/Elephas_maximus.html
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Deborah Ciszek, University of Michigan-Ann Arbor
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Conservation Status

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Asian elephants have a long history of being hunted by people, originally for food, later for domestic stock and ivory. Poaching for ivory continues to devastate wild populations. They also suffer due to habitat loss caused by agriculture and deforestation. Centuries ago they disappeared from southwestern Asia and most of China. Currently there are only an estimated 28,000 to 42,000 wild Asian elephants remaining. Asian elephants are kept as domestic animals and can be successfully bred in captivity to a limited extent.

Asian elephants are on Appendix I of the Convention on International Trade in Endangered Species and are considered endangered by the International Union for the Conservation of Nature.

US Federal List: endangered

CITES: appendix i

IUCN Red List of Threatened Species: endangered

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Ciszek, D. 1999. "Elephas maximus" (On-line), Animal Diversity Web. Accessed April 27, 2013 at http://animaldiversity.ummz.umich.edu/site/accounts/information/Elephas_maximus.html
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Deborah Ciszek, University of Michigan-Ann Arbor
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Benefits

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Elephants enjoy cultivated foods such as bananas and sugar cane, and so can become crop pests in some areas. Wild elephants are can be aggressive to humans and dangerous.

Negative Impacts: crop pest

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Ciszek, D. 1999. "Elephas maximus" (On-line), Animal Diversity Web. Accessed April 27, 2013 at http://animaldiversity.ummz.umich.edu/site/accounts/information/Elephas_maximus.html
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Deborah Ciszek, University of Michigan-Ann Arbor
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Reproduction

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Mating System: polygynous

Female Asian elephants bear a single calf (usually) after a gestation of more than a year and a half (18 to 22 months). Their estrus cycle is about 22 days, out of which they are receptive to copulation on only one day, the first day of estrus. There is no seasonality in their reproduction. Females on good quality habitats give birth every three to four years, while the interbirth interval can be much longer among females inhabiting poor quality areas. Newborns weigh about 100 kg and can stand soon after birth. The infant may nurse from its mother or from other lactating females. After a few days it can follow its mother as she goes about her normal activities. Young begin to eat some grass after several months but may continue nursing for 18 months. They also eat their mother's dung, which contains nutrients as well as the symbiotic bacteria that aid in the digestion of cellulose. Mothers continue to supervise their young for several years after weaning. Both sexes become sexually mature at about 14 years of age, but males cannot mate until they can dominate other adult males. Males leave their natal herd at this age, but females remain with their female relatives throughout their lives.

Breeding interval: Under the best of circumstances Asian elephants give birth every three to four years.

Breeding season: Births may occur throughout the year.

Average number of offspring: 1.

Range gestation period: 18 to 22 months.

Average weaning age: 48 months.

Average time to independence: 48 months.

Average age at sexual or reproductive maturity (female): 14 years.

Average age at sexual or reproductive maturity (male): 14 years.

Key Reproductive Features: iteroparous ; year-round breeding ; gonochoric/gonochoristic/dioecious (sexes separate); sexual ; viviparous

Average birth mass: 107000 g.

Average number of offspring: 1.

Average age at sexual or reproductive maturity (male)
Sex: male:
3287 days.

Average age at sexual or reproductive maturity (female)
Sex: female:
3287 days.

Parental Investment: pre-fertilization (Provisioning, Protecting: Female); pre-hatching/birth (Provisioning: Female, Protecting: Female); pre-weaning/fledging (Provisioning: Female, Protecting: Female); pre-independence (Provisioning: Female, Protecting: Female); post-independence association with parents; extended period of juvenile learning

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Ciszek, D. 1999. "Elephas maximus" (On-line), Animal Diversity Web. Accessed April 27, 2013 at http://animaldiversity.ummz.umich.edu/site/accounts/information/Elephas_maximus.html
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Deborah Ciszek, University of Michigan-Ann Arbor
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Biology

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Elephants are highly intelligent and long-lived animals; Asian elephants may live as long as 70 years (5). They are extremely sociable and occur in groups of related females, led by the oldest female known as the 'matriarch'. Groups of Asian elephants average six to seven individuals, and will occasionally join with other groups to form herds; although these are more transient than those of African savanna elephants (2). Males leave their natal group when then reach sexual maturity at around six to seven years of age, after which time they are predominantly solitary (2). When males reach 20 years old they start coming into 'musth', an extreme state of arousal when levels of testosterone in the blood may increase 20 times (2). This state lasts about three weeks and during this time the individual will become aggressive and wander widely in search of females (2). Musth may cause males to fight for access to females and also increases their attractiveness to females. Cows only reach sexual maturity at ten years of age (6), and the interval between births may be as long as four years owing to the long gestation time and infant dependency (4). The single calf may suckle from other females in the group as well as their own mother (4). Elephants use their dextrous trunk to pluck at grasses and pass them into their mouths; the average daily intake of food is 150 kilograms of vegetation a day (5). Grasses make up the mainstay of the Asian elephant's diet but scrub and bark are also eaten, and calves may eat their mothers dung to obtain nutrients (2). Where elephants occur near plantations they will readily feed on banana or rice crops. Asian elephants have had a close relationship with man over the centuries; they are still used to clear timber particularly in some of the more inaccessible forests of the continent, and play an important role in the religious and cultural history of the region (2).
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Conservation

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The Asian elephant is protected from international trade by its listing on Appendix I of the Convention on International Trade in Endangered Species (CITES), although illegal poaching remains a problem (3). Many elephants occur within protected reserves but these are often too small to accommodate them, leading to human-elephant conflict (3). The creation of wildlife corridors to extend reserve lands, together with the cessation of poaching are just some of the conservation steps needed to secure the future of the Asian elephant (7). The World Wildlife Fund (WWF) launched the Asian Rhino and Elephant Action Strategy (AREAS) in 1998 to address these issues, and this multifaceted conservation programme is also working with local people to reduce conflict with these magnificent animals (7).
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Description

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Asian elephants are smaller than their African savannah relatives (Loxodonta africana) and have many other physical features that distinguish them. The ears are smaller and the back is more rounded so that the crown of the head is the highest point of the body (2). One of the characteristic features of an elephant are the modified incisor teeth which are known as tusks, however, only some male Asian elephants have tusks, whilst females (cows) have 'tushes' instead, that are seldom visible (3). Elephants support their stocky body on stout, pillar-like legs, and the nose and upper lip are joined and elongated into a trunk (3). The trunk provides a wide variety of functions from feeding, vocalisation, bathing and fighting; those of the Asian elephant have only a single finger-like process on the base, whilst the African elephant has two (4). The thick, wrinkly skin covering the body is a greyish-brown colour and very dry (5).
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Habitat

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Asian elephants inhabit scrub forest, preferring areas that combine grass with low woody plants and trees (5).
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Range

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This species once roamed through much of the Asian Continent south of the Himalayas, extending into China and south to the islands of Sumatra and Borneo (3). Three subspecies are currently recognised; in Sri Lanka (Elephas maximus maximus), Sumatra (E. m. sumatranus) and on the mainland of Asia (E. m. indicus) (2). Some scientists also place the Bornean elephant as a separate subspecies (E. m. borneensis) (3).
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Status

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Classified as Endangered (EN) on the IUCN Red List 2007 (1), and listed on Appendix I of CITES (8).
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Threats

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Numbers of Asian elephants were decimated by habitat loss and hunting throughout their historical range. Vast tracts of land have been logged or simply cleared to accommodate the growing human population in the region (2). Elephant populations have become increasingly isolated in the fragmented habitat that remains, often coming into conflict with local farmers (6). Crops are damaged and lives lost; up to 300 people a year are killed by elephants in India (3), leading to retaliation on local elephants (7). Poaching for ivory is also a threat and because only males have tusks, populations can become extremely skewed towards females, thus affecting breeding rates (2).
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Benefits

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พบมากในมหาสมุทรแปซิฟิก กินสาหร่ายเป็นอาหาร
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Benefits

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Other than general utilities in transportation and animal labor, elephants have been integrated into the Asian cultures as useful animals for war animals. Due to their size and strength, elephants were often used as part of cavalry unit to intimidate enemies and drive back infantry.

Comprehensive Description

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Elephant (Elephas maximus)

We were able to ascertain the movement patterns for one major herd within the park system. Two other herds which were reasonably well known to us had their ranges partially mapped whereas the fourth could only be surveyed sporadically. Table 3 portrays the counts from those herds for which we have the best data. Three of the four herds spent at least part of the time in the West Sanctuary. We counted sixty-one individual animals and we estimate that roughly seventy animals, including some bulls that we may have missed, utilize the core national park area throughout most of the year. If we include the other protected areas, such as the entire West Sanctuary, the newly incorporated south intermediate zone, and the east intermediate zone, a reasonable figure for the total elephant population within the national park boundaries and associated protected areas would be at least twice as large or 140 to 150 elephants. In addition an unknown number of elephants in the vicinity of the south bank of the Kala Oya do cross over into the park and its associated intermediate zones and sanctuaries; hence, the overall population of elephants dependent in part on Wilpattu Park may be close to 200 animals.
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Eisenberg, John F. and Lockhart, Melvyn. 1972. "An ecological reconnaissance of Wilpattu National Park, Ceylon." Smithsonian Contributions to Zoology. 1-118. https://doi.org/10.5479/si.00810282.101

Asian elephant

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The Asian elephant (Elephas maximus), also known as the Asiatic elephant, is the only living species of the genus Elephas and is distributed throughout the Indian subcontinent and Southeast Asia, from India in the west, Nepal in the north, Sumatra in the south, and to Borneo in the east. Three subspecies are recognised—E. m. maximus from Sri Lanka, E. m. indicus from mainland Asia and E. m. sumatranus from the island of Sumatra.[1] Formerly, there was also the Syrian elephant or Western Asiatic elephant (Elephas maximus asurus) which was the westernmost population of the Asian elephant (Elephas maximus). This subspecies became extinct in ancient times.[5] Skeletal remains of E. m. asurus have been recorded from the Middle East: Iran, Iraq, Syria, and Turkey from periods dating between at least 1800 BC and likely 700 BC.[6] It is one of only three living species of elephants or elephantids anywhere in the world, the others being the African bush elephant and African forest elephant. It is the second largest species of elephant after the African bush elephant.

The Asian elephant is the largest living land animal in Asia.[7] Since 1986, the Asian elephant has been listed as Endangered on the IUCN Red List, as the population has declined by at least 50 percent over the last three elephant generations, which is about 60–75 years. It is primarily threatened by loss of habitat, habitat degradation, fragmentation and poaching.[5] In 2019, the wild population was estimated at 48,323–51,680 individuals.[8] Female captive elephants have lived beyond 60 years when kept in semi-natural surroundings, such as forest camps. In zoos, Asian elephants die at a much younger age; captive populations are declining due to a low birth and high death rate.[9]

The genus Elephas originated in Sub-Saharan Africa during the Pliocene and spread throughout Africa before expanding into the southern half of Asia.[2] The earliest indications of captive use of Asian elephants are engravings on seals of the Indus Valley civilisation dated to the 3rd millennium BC.[10]

Taxonomy

Carl Linnaeus proposed the scientific name Elephas maximus in 1758 for an elephant from Ceylon.[11] Elephas indicus was proposed by Georges Cuvier in 1798, who described an elephant from India.[12] Coenraad Jacob Temminck named an elephant from Sumatra Elephas sumatranus in 1847.[13] Frederick Nutter Chasen classified all three as subspecies of the Asian elephant in 1940.[14] These three subspecies are currently recognised as valid taxa.[7][5] Results of phylogeographic and morphological analyses indicate that the Sri Lankan and Indian elephants are not distinct enough to warrant classification as separate subspecies.[15]

Three subspecies are recognised:[5][7]

A fourth potential subspecies, the Borneo elephant, occurs in Borneo's northeastern parts, primarily in Sabah (Malaysia), and sometimes in Kalimantan (Indonesia).[16] Elephas maximus borneensis was proposed by Paules Edward Pieris Deraniyagala in 1950 who described an elephant in an illustration published in the National Geographic magazine, but not a living elephant in accordance with the rules of the International Code of Zoological Nomenclature.[17][18] The Asian elephants living in northern Borneo are smaller than all the other subspecies, but with larger ears, a longer tail, and straight tusks. Results of genetic analysis indicate that their ancestors separated from the mainland population about 300,000 years ago.[19] In 2003, mitochondrial DNA analysis and microsatellite data indicated that the Borneo elephant population is derived from stock that originated in the region of the Sunda Islands. The genetic divergence of Borneo elephants warrants their recognition as a separate Evolutionarily Significant Unit.[20]

The following Asian elephants were proposed as extinct subspecies, but are now considered synonymous with the Indian elephant:[7]

The Asian elephant is the closest living relative of the extinct mammoths; the last common ancestor of the two is estimated to have lived between 2.5 to 5.4 million years ago.[22]

Description

Illustration of an elephant skeleton[23]
The nail-like structures on the toes of an Asian elephant

In general, the Asian elephant is smaller than the African bush elephant and has the highest body point on the head. The back is convex or level. The ears are small with dorsal borders folded laterally. It has up to 20 pairs of ribs and 34 caudal vertebrae. The feet have five nail-like structures on each forefoot, and four on each hind foot.[7] The forehead has two hemispherical bulges, unlike the flat front of the African elephants.[24] Its long trunk or proboscis has only one fingerlike tip, in contrast to the African elephants which have two.[7] Hence the Asian species relies more on wrapping around a food item and squeezing it into its mouth, rather than grasping with the tip. Asian elephants have more muscle coordination and can perform more complex tasks.[25]

Cows usually lack tusks; if tusks—in that case, called "tushes"—are present, they are barely visible and only seen when the mouth is open. The enamel plates of the molars are greater in number and closer together in Asian elephants. Some bulls may also lack tusks; these individuals are called "filsy makhnas", and are especially common among the Sri Lankan elephant population.[24] A record tusk described by George P. Sanderson measured 5 ft (1.5 m) along the curve, with a girth of 16 in (41 cm) at the point of emergence from the jaw, the weight being 104+12 lb (47.4 kg). This was from an elephant killed by Sir Brooke and measured 8 ft (2.4 m) in length, and nearly 17 in (43 cm) in circumference, and weighed 90 lb (41 kg). The tusk's weight was, however, exceeded by the weight of a shorter tusk of about 6 ft (1.8 m) in length which weighed 100 lb (45 kg).[23]

Depigmented skin on the forehead and ears of an Asian elephant

Skin colour is usually grey, and may be masked by soil because of dusting and wallowing. Their wrinkled skin is movable and contains many nerve centres. It is smoother than that of African elephants and may be depigmented on the trunk, ears, or neck. The epidermis and dermis of the body average 18 mm (0.71 in) thick; skin on the dorsum is 30 mm (1.2 in) thick providing protection against bites, bumps, and adverse weather. Its folds increase surface area for heat dissipation. They can tolerate cold better than excessive heat. Skin temperature varies from 24 to 32.9 °C (75.2 to 91.2 °F). Body temperature averages 35.9 °C (96.6 °F).[7]

Size

On average, when fully-grown, bulls are about 2.75 m (9.0 ft) tall at the shoulder and 4.0 t (4.4 short tons) in weight, while cows are smaller at about 2.40 m (7.9 ft) at the shoulder and 2.7 t (3.0 short tons) in weight.[26][27][28] Sexual dimorphism in body size is relatively less pronounced in Asian elephants than in African bush elephants; with bulls averaging 15% and 23% taller in the former and latter respectively.[26] Length of body and head including trunk is 5.5–6.5 m (18–21 ft) with the tail being 1.2–1.5 m (3.9–4.9 ft) long.[7] The largest bull elephant ever recorded was shot by the Maharajah of Susang in the Garo Hills of Assam, India in 1924, it weighed an estimated 7 t (7.7 short tons), stood 3.43 m (11.3 ft) tall at the shoulder and was 8.06 m (26.4 ft) long from head to tail.[26][29][30] There are reports of larger individuals as tall as 3.7 m (12 ft).[23]

Distribution and habitat

An elephant herd in the grasslands of Jim Corbett National Park
Asian elephant grazing on the banks of Kabini River, Nagarhole National Park
Asian elephant in Thailand
Asian elephant walking in Tad Lo river, Salavan Province, Laos.

Asian elephants inhabit grasslands, tropical evergreen forests, semi-evergreen forests, moist deciduous forests, dry deciduous forests and dry thorn forests, in addition to cultivated and secondary forests and scrublands. Over this range of habitat types elephants occur from sea level to over 3,000 m (9,800 ft). In the eastern Himalaya in northeast India, they regularly move up above 3,000 m (9,800 ft) in summer at a few sites.[31]

In China, the Asian elephant survives only in the prefectures of Xishuangbanna, Simao, and Lincang of southern Yunnan. Estimated population is around 300 individual (in 2020).[32]

In Bangladesh, some isolated populations survive in the south-east Chittagong Hills.[10] A herd of 20–25 wild elephants was reported as being present in the Garo Hills of Mymensingh in the late-1990s, being detached from a big herd in the Peack hills of India and prevented from returning by fences put up in the meantime by the Indian border security force. The herd was estimated at about 60 individuals in 2014.[33]

In Malaysia's northern Johor and Terengganu National Park, two Asian elephants were tracked using satellite tracking technology. They spent most of their time in the secondary or "logged-over forest" and travelled 75% of their time in an area of less than 1.5 km (0.93 mi) away from a water source.[34]

Ecology and behaviour

A 5-month-old calf and its 17-month-old cousin in a sanctuary in Laos

Asian elephants are crepuscular.[7] They are classified as megaherbivores and consume up to 150 kg (330 lb) of plant matter per day.[35] They are generalist feeders, and are both grazers and browsers. They are known to feed on at least 112 different plant species, most commonly of the order Malvales, as well as the legume, palm, sedge and true grass families.[36] They browse more in the dry season with bark constituting a major part of their diet in the cool part of that season.[37] They drink at least once a day and are never far from a permanent source of fresh water.[7] They need 80–200 litres of water a day and use even more for bathing. At times, they scrape the soil for clay or minerals.

Cows and calves move about together as groups, while bulls disperse from their mothers upon reaching adolescence. Bulls are solitary or form temporary "bachelor groups".[38] Cow-calf units generally tend to be small, typically consisting of three adults (most likely related females) and their offspring.[39] Larger groups of as many as 15 adult females have also been recorded.[40] Seasonal aggregations of 17 individuals including calves and young adults have been observed in Sri Lanka's Uda Walawe National Park. Until recently, Asian elephants, like African elephants, were thought to be under the leadership of older adult females, or matriarchs. It is now recognized that cows form extensive and very fluid social networks, with varying degrees of associations between individuals.[41] Social ties generally tend to be weaker than in African elephants.[40]

Unlike African elephants, which rarely use their forefeet for anything other than digging or scraping soil, Asian elephants are more agile at using their feet in conjunction with the trunk for manipulating objects. They can sometimes be known for their violent behavior.[24]

Asian elephants are recorded to make three basic sounds: growls, squeaks and snorts. Growls in their basic form are used for short distance communication. During mild arousal, growls resonate in the trunk and become rumbles while for long-distance communication, they escalate into roars. Low-frequency growls are infrasonic and made in many contexts. Squeaks come in two forms; chirpings and trumpets. Chirping consists of multiple short squeaks and signal conflict and nervousness. Trumpets are lengthened squeaks with increased loudness and produced during extreme arousal. Snorts signal changes in activity and increase in loudness during mild or strong arousal. During the latter case, when an elephant bounces the tip of the trunk it creates booms which serve as threat displays.[9]: 142  Elephants are able to distinguish low-amplitude sounds.[42]

Rarely, tigers have been recorded attacking and killing calves, especially if the calves become separated from their mothers, stranded from their herd, or orphaned. Adults are largely invulnerable to natural predation. There is a singular anecdotal case of a mother Asian elephant allegedly being killed alongside her calf; however, this account is contestable.[43][44] In 2011 and 2014, two instances were recorded of tigers successfully killing adult elephants; one by a single tiger in Jim Corbett National Park on a 20-year-old elephant, and another on a 28-year-old elephant in Kaziranga National Park further east, which was taken down and eaten by several tigers hunting cooperatively.[45] Elephants appear to distinguish between the growls of larger predators like tigers and smaller predators like leopards; they react to leopards less fearfully and more aggressively.[46]

Reproduction

Reproduction in Asian elephants can be attributed to the production and perception of signaling compounds called pheromones.[47] These signals are transmitted through various bodily fluids. They are commonly released in urine but in males they are also found in special secretions from the temporal glands.[47] Once integrated and perceived, these signals provide the receiver with information about the reproductive status of the sender. If both parties are ready to breed, reproductive ritualic behavior occurs and the process of sexual reproduction proceeds.[48]

Indian elephants in the Coimbatore Forests, Tamil Nadu

Bulls will fight one another to get access to oestrus cows. Strong fights over access to females are extremely rare. Bulls reach sexual maturity around the age of 12–15. Between the age of 10 and 20 years, bulls undergo an annual phenomenon known as "musth". This is a period where the testosterone level is up to 100 times greater than non-musth periods, and they become aggressive. Secretions containing pheromones occur during this period, from the paired temporal glands located on the head between the lateral edge of the eye and the base of the ear.[49] The aggressive behaviors observed during musth can be attributed to varying amounts of frontalin (1,5-dimethyl-6,8-dioxabicyclo[3.2.1]octane) throughout the maturation process of bulls.[50] Frontalin is a pheromone that was first isolated in bark beetles but can also be produced in the bulls of both Asian and African Elephants.The compound can be excreted through urine as well as through the temporal glands of the bull allowing signaling to occur.[50] During musth, increased concentrations of frontalin in the bull's urine communicate the reproductive status of the bull to female elephants.[50]

Similar to other mammals, hormone secretion in female elephants is regulated by an estrous cycle. This cycle is regulated by surges in Luteinizing Hormone that are observed 3 weeks from each other.[51] This type of estrous cycle has also been observed in African Elephants but not known to affect other mammals. The first surge in Luteinizing Hormone is not followed by the release of an egg from the ovaries.[51] However, some female elephants still exhibit the expected mating protocols during this surge. Female elephants give ovulatory cues by utilizing sex pheromones. A principal component thereof, (Z)-7-dodecen-1-yl acetate, has also been found to be a sex pheromone in numerous species of insects.[52][53] In both insects and elephants, this chemical compound is used as an attractant to assist the mating process.[54] In elephants, the chemical is secreted through urination and this aids in the attraction of bulls to mate. Once detected, the chemical stimulates the vomeronasal organ of the bull thus providing information on the maturity of the female.[54]

Reproductive signaling exchange between male and female elephants are transmitted through olfactory cues in bodily fluids.[48] In males, the increase in frontalin during musth heightens their sensitivity to the (Z)-7-dodecen-1-yl acetate produced by female elephants.[50] Once perceived by receptors in the trunk, a sequence of ritualistic behaviors follow.[48] The responses in males vary based on both the stage of development and the temperament of the elephant.[48] This process of receiving and processing signals through the trunk is referred to as flehmen.[55] The difference in body movements give cues to gauge if the male is interested in breeding with the female that produced the secretion.[55] A bull that is ready to breed will move closer to the urine and in some cases an erection response is elicited. A bull that is not ready to breed will be timid and try to dissociate themselves from the signal.[48]

In addition to reproductive communication, chemosensory signaling is used to facilitate same-sex interactions.[55] When less developed males detect pheromones from a male in musth, they often retreat to avoid coming in contact with aggressive behaviors.[55] Female elephants have also been seen to communicate with each other through pheromone in urine.[48][55] The purpose of this type of intersex communication is still being investigated. However, there are clear differences in signaling strength and receiver response throughout different stages of the estrous cycle.[55]

The gestation period is 18–22 months, and the cow gives birth to one calf, only occasionally twins. The calf is fully developed by the 19th month, but stays in the womb to grow so that it can reach its mother to feed. At birth, the calf weighs about 100 kg (220 lb), and is suckled for up to three years. Once a female gives birth, she usually does not breed again until the first calf is weaned, resulting in a four to five-year birth interval. During this period, mother to calf communication primarily takes place through temporal means. However, male calves have been known to develop sex pheromone producing organs at a young age.[56] Early maturity of the vomeronasal organ allows immature elephants to produce and receive pheromones.[56] It is unlikely that the integration of these pheromones will result in a flehmen response in a calf.[55] Females stay on with the herd, but mature males are chased away.[57]

Asian elephants reach adulthood at 17 years of age in both sexes.[58] Average elephant life expectancy is 60 years in the wild and 80 in captivity, although this has been exaggerated in the past.[7] Generation length of the Asian elephant is 22 years.[59]

Intelligence

Asian elephants have a very large and highly developed neocortex, a trait also shared by humans, apes and certain dolphin species. They have a greater volume of cerebral cortex available for cognitive processing than all other existing land animals. Results of studies indicate that Asian elephants have cognitive abilities for tool use and tool-making similar to great apes.[60] They exhibit a wide variety of behaviours, including those associated with grief, learning, allomothering, mimicry, play, altruism, use of tools, compassion, cooperation, self-awareness, memory, and language. Elephants reportedly head to safer ground during natural disasters like tsunamis and earthquakes, but data from two satellite-collared Sri Lankan elephants indicate this may be untrue.[61]

Several students of elephant cognition and neuroanatomy are convinced that Asian elephants are highly intelligent and self-aware.[62][63][64] Others contest this view.[65][66]

Threats

The pre-eminent threats to the Asian elephant today are the loss, degradation and fragmentation of its habitat, which leads to increasing conflicts between humans and elephants. Asian elephants are poached for ivory and a variety of other products including meat and leather.[5] The demand for elephant skin has risen due to it being an increasingly-common ingredient in traditional Chinese medicine.

Human–elephant conflict

Prime elephant habitat cleared for jhum—a type of shifting cultivation practiced in Arunachal Pradesh
Elephants on the road in Khao Yai National Park, Thailand

In some parts of Asia, people and elephants have co-existed for thousands of years.[67] In other areas, people and elephants come into conflict, resulting in violence and ultimately displacement of elephants.

Destruction of forests through logging, encroachment, slash-and-burn, shifting cultivation, and monoculture tree plantations are major threats to the survival of elephants. Human–elephant conflicts occur when elephants raid crops of shifting cultivators in fields, which are scattered over a large area interspersed with forests. Depredation in human settlements is another major area of human–elephant conflict occurring in small forest pockets, encroachments into elephant habitat, and on elephant migration routes.[68] However, studies in Sri Lanka indicate that traditional slash-and-burn agriculture may create optimal habitat for elephants by creating a mosaic of successional-stage vegetation. Populations inhabiting small habitat fragments are much more liable to come into conflict with humans.[69]

Human-elephant conflict can be categorised into:[70]

Development such as border fencing along the India–Bangladesh border has become a major impediment to the free movement of elephants.[71] In Assam, more than 1,150 humans and 370 elephants died as a result of human-elephant conflict between 1980 and 2003.[68] In India alone, over 400 people are killed by elephants every year, and 0.8 to 1 million hectares are damaged, affecting at least 500,000 families across the country.[72][73][74] Moreover, elephants are known to destroy crops worth up to US$2–3 million annually.[75] This has major impacts on the welfare and livelihoods of local communities, as well as the future conservation of this species.[70] In countries like Bangladesh and Sri Lanka, the Asian elephant is one of the most feared wild animals, even though they are less deadly than other local animals such as venomous snakes (which were estimated to claim more than 30 times more lives in Sri Lanka than elephants).[76][77] As a whole, Asian elephants display highly sophisticated and sometimes unpredictable behaviour. Most untamed elephants try to avoid humans, but if they are caught off guard by any perceived physical threat, including humans, they will likely charge. This is especially true of males in musth and of females with young. Gunfire and other similar methods of deterring, which are known to be effective against many kinds of wild animals including tigers, may or may not work with elephants, and can even worsen the situation. Elephants that have been abused by humans in the past often become "rogue elephants", which regularly attack people with no provocation.[78][79][80]

Poaching

For ivory

The demand for ivory during the 1970s and 1980s, particularly in East Asia, led to rampant poaching and the serious decline of elephants in both Africa and Asia. In Thailand, the illegal trade in live elephants and ivory still flourishes. Although the amount of ivory being openly sold has decreased substantially since 2001, Thailand still has one of the largest and most active black markets for ivory seen anywhere in the world. Tusks from Thai poached elephants also enter the market; between 1992 and 1997 at least 24 male elephants were killed for their tusks.[81]

Up to the early 1990s, Vietnamese ivory craftsmen used exclusively Asian elephant ivory from Vietnam and neighbouring Lao and Cambodia. Before 1990, there were few tourists and the low demand for worked ivory could be supplied by domestic elephants. Economic liberalisation and an increase in tourism raised both local and visitors' demands for worked ivory, which resulted in heavy poaching.[82]

For skin

The skin of the Asian elephant is used as an ingredient in Chinese medicine as well as in the manufacture of ornamental beads. The practice has been aided by China's State Forestry Administration (SFA), which has issued licences for the manufacture and sale of pharmaceutical products containing elephant skin, thereby making trading legal. In 2010, four skinned elephants were found in a forest in Myanmar; 26 elephants were killed by poachers in 2013 and 61 in 2016. According to the NGO Elephant Family, Myanmar is the main source of elephant skin, where a poaching crisis has developed rapidly since 2010.[83]

Handling methods

Young elephants are captured and illegally imported to Thailand from Myanmar for use in the tourism industry; calves are used mainly in amusement parks and are trained to perform various stunts for tourists.[81]

The calves are often subjected to a 'breaking in' process, which may involve being tied up, confined, starved, beaten and tortured; as a result, two-thirds may perish.[84] Handlers use a technique known as the training crush, in which "handlers use sleep-deprivation, hunger, and thirst to "break" the elephants' spirit and make them submissive to their owners"; moreover, handlers drive nails into the elephants' ears and feet.[85]

Disease

Conservation

The Asian elephant is listed on CITES Appendix I.[5] It is a quintessential flagship species, deployed to catalyze a range of conservation goals, including habitat conservation at landscape scales, generating public awareness on conservation issues, and mobilisation as a popular cultural icon both in India and the West.[86][87][70] A key aspect of Asian elephant conservation is connectivity, and preserving the preferred movement routes of elephants through areas of high vegetation cover and with "low human population density".[88]

The World Elephant Day is celebrated on 12 August since 2012. Events are organized to divulge information and to engage people about the problems that the Asian elephant is facing.[89] August has been established as the Asian Elephant Awareness Month by zoos and conservation partners in the United States.[90]

In China, Asian elephants are under first-level protection. Yunnan province has 11 national and regional nature reserves. In total, the covered protected area in China is about 510,000 km2 (200,000 sq mi). In 2020, the population of Asian elephants in Yunnan was estimated at around 300 individuals. As conflicts between humans and wild elephants have emerged around protected areas in the last years, the prefecture of Xishuangbanna built food bases and planted bananas and bamboo to create a better habitat.[32]

In Thailand, Salakpra Wildlife Sanctuary and Tham Than Lot National Park are protected areas hosting around 250–300 elephants, according to figures from 2013.[91] In recent years the National Park has faced issues due to encroachment and over-exploitation.[92]

In India, the National Board of Wildlife did a recommendation, allowing coal mining in the Dehing Patkai elephant reserve in April 2020. The decision raised concerns between students and environmental activists who launched an online campaign to stop the project.[93]

In captivity

Rhythmic swaying behaviour is not reported in free ranging wild elephants and may be symptomatic of psychological disorders.

About half of the global zoo elephant population is kept in European zoos, where they have about half the median life span of conspecifics in protected populations in range countries. This discrepancy is clearest in Asian elephants: infant mortality is twice that seen in Burmese timber camps, and adult survivorship in zoos has not improved significantly in recent years. One risk factor for Asian zoo elephants is being moved between institutions, with early removal from the mother tending to have additional adverse effects. Another risk factor is being born into a zoo rather than being imported from the wild, with poor adult survivorship in zoo-born Asians apparently being conferred prenatally or in early infancy. Likely causes for compromised survivorship is stress and/or obesity.[94] Foot problems are commonly observed in captives elephants. These are related to lack of exercise, long hours standing on hard substrates, and contamination resulting from standing in their dung. Many of the problems are treatable. However, mistreatment may lead to serious disability or death.[95]

Demographic analysis of captive Asian elephants in North America indicates that the population is not self-sustaining. First year mortality is nearly 30 per cent, and fecundity is extremely low throughout the prime reproductive years.[96] Data from North American and European regional studbooks from 1962 to 2006 were analysed for deviation of the birth and juvenile death sex ratio. Of 349 captive calves born, 142 died prematurely. They died within one month of birth, major causes being stillbirth and infanticide by either the calf's mother or by one of the exhibition mates. The sex ratio of stillbirths in Europe was found to have a tendency for excess of males.[97]

In culture

Elephants are used for safari tourism in some Asian countries
At this elephant training camp, captive elephants are taught to handle logs.

Bones of Asian elephants excavated at Mohenjo-daro in the Indus Valley indicate that they were tamed in the Indus Valley civilization and used for work. Decorated elephants are also depicted on seals and were modelled in clay.[98]

The Asian elephant became a siege engine, a mount in war, a status symbol, a beast of burden, and an elevated platform for hunting during historical times in South Asia.[99]

Asian elephants have been captured from the wild and tamed for use by humans. Their ability to work under instruction makes them particularly useful for carrying heavy objects. They have been used particularly for timber-carrying in jungle areas. Other than their work use, they have been used in war, in ceremonies, and for carriage. It is reported that war elephants are still in use by the Kachin Independence Army (KIA) to take control of Kachin State in northern Myanmar from Myanmar's military. The KIA use about four dozen elephants to carry supplies.[100]

The Asian elephant plays an important part in the culture of the subcontinent and beyond, being featured prominently in the Panchatantra fables and the Buddhist Jataka tales. They play a major role in Hinduism: the god Ganesha's head is that of an elephant, and the "blessings" of a temple elephant are highly valued. Elephants are frequently used in processions where the animals are adorned with festive outfits.

The Asian elephant is depicted in several Indian manuscripts and treatises. Notable amongst these is the Matanga Lila (elephant sport) of Nilakantha.[101] The manuscript Hastividyarnava is from Assam in northeast India.

In the Burmese, Thai and Sinhalese animal and planetary zodiac, the Asian elephant, both tusked and tuskless, are the fourth and fifth animal zodiacs of the Burmese, the fourth animal zodiac of the Thai, and the second animal zodiac of the Sinhalese people of Sri Lanka.[102] Similarly, the elephant is the twelfth animal zodiac in the Dai animal zodiac of the Dai people in southern China.[103]

See also

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Asian elephant: Brief Summary

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The Asian elephant (Elephas maximus), also known as the Asiatic elephant, is the only living species of the genus Elephas and is distributed throughout the Indian subcontinent and Southeast Asia, from India in the west, Nepal in the north, Sumatra in the south, and to Borneo in the east. Three subspecies are recognised—E. m. maximus from Sri Lanka, E. m. indicus from mainland Asia and E. m. sumatranus from the island of Sumatra. Formerly, there was also the Syrian elephant or Western Asiatic elephant (Elephas maximus asurus) which was the westernmost population of the Asian elephant (Elephas maximus). This subspecies became extinct in ancient times. Skeletal remains of E. m. asurus have been recorded from the Middle East: Iran, Iraq, Syria, and Turkey from periods dating between at least 1800 BC and likely 700 BC. It is one of only three living species of elephants or elephantids anywhere in the world, the others being the African bush elephant and African forest elephant. It is the second largest species of elephant after the African bush elephant.

The Asian elephant is the largest living land animal in Asia. Since 1986, the Asian elephant has been listed as Endangered on the IUCN Red List, as the population has declined by at least 50 percent over the last three elephant generations, which is about 60–75 years. It is primarily threatened by loss of habitat, habitat degradation, fragmentation and poaching. In 2019, the wild population was estimated at 48,323–51,680 individuals. Female captive elephants have lived beyond 60 years when kept in semi-natural surroundings, such as forest camps. In zoos, Asian elephants die at a much younger age; captive populations are declining due to a low birth and high death rate.

The genus Elephas originated in Sub-Saharan Africa during the Pliocene and spread throughout Africa before expanding into the southern half of Asia. The earliest indications of captive use of Asian elephants are engravings on seals of the Indus Valley civilisation dated to the 3rd millennium BC.

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