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Lifespan, longevity, and ageing

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Maximum longevity: 10.5 years (captivity) Observations: There is a delay in the implantation, so the total gestation time can take from 50 to 234 days. One wild born specimen of the *gracilis* subspecies was about 10-11 years old when it died in captivity (Richard Weigl 2005).
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Untitled

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These skunks are often accidently killed because they are slow moving and are hit by motorists when they attempt to cross roadways. (Davis and Schmidley 1994)

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Pennington, S. 2002. "Spilogale putorius" (On-line), Animal Diversity Web. Accessed April 27, 2013 at http://animaldiversity.ummz.umich.edu/site/accounts/information/Spilogale_putorius.html
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Stefanie Pennington, Southwestern University
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Behavior

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Perception Channels: tactile ; chemical

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Pennington, S. 2002. "Spilogale putorius" (On-line), Animal Diversity Web. Accessed April 27, 2013 at http://animaldiversity.ummz.umich.edu/site/accounts/information/Spilogale_putorius.html
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Stefanie Pennington, Southwestern University
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Conservation Status

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US Federal List: no special status

CITES: no special status

IUCN Red List of Threatened Species: least concern

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Pennington, S. 2002. "Spilogale putorius" (On-line), Animal Diversity Web. Accessed April 27, 2013 at http://animaldiversity.ummz.umich.edu/site/accounts/information/Spilogale_putorius.html
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Stefanie Pennington, Southwestern University
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Benefits

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Eastern Spotted Skunks are deliberately killed by humans for their pelts.

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Pennington, S. 2002. "Spilogale putorius" (On-line), Animal Diversity Web. Accessed April 27, 2013 at http://animaldiversity.ummz.umich.edu/site/accounts/information/Spilogale_putorius.html
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Stefanie Pennington, Southwestern University
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Trophic Strategy

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These skunks are omnivorous. Their natural food sources depend on the seasons: In winter, they eat cottontails and corn; in spring, native field mice and insects; in summer, insects with small amounts of fruits, birds, and birds' eggs, and in fall, predominately insects. They are excellent rodent catchers. -S.putorius- has also been known to knock down beehives for the honeycomb, despite the many bee stings the animal receives. (Davis and Schmidley 1994, Grzmek 1972)

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Pennington, S. 2002. "Spilogale putorius" (On-line), Animal Diversity Web. Accessed April 27, 2013 at http://animaldiversity.ummz.umich.edu/site/accounts/information/Spilogale_putorius.html
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Distribution

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Eastern Spotted Skunks (Spilogale putorius) are found throughout much of the eastern United States. They are found as far north as Minnesota and south through Central America to El Salvador. They occur as far west as eastern Wyoming and Colorado. They occur throughout the midwestern states, in the Appalachian mountains as far north as Pennsylvania, throughout Florida, and to eastern Texas.

Biogeographic Regions: nearctic (Native )

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Pennington, S. 2002. "Spilogale putorius" (On-line), Animal Diversity Web. Accessed April 27, 2013 at http://animaldiversity.ummz.umich.edu/site/accounts/information/Spilogale_putorius.html
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Stefanie Pennington, Southwestern University
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Habitat

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Spilogale putorius occupies mostly wooded areas and tall-grass prairies and many times prefers rocky habitats. It lives in holes either self-dug or abandoned burrows from other animals. Except during mating season, these skunks prefer to live with several skunks in one burrow.(Davis and Schmidley 1994, Grzmek 1972)

Terrestrial Biomes: savanna or grassland ; forest ; mountains

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Pennington, S. 2002. "Spilogale putorius" (On-line), Animal Diversity Web. Accessed April 27, 2013 at http://animaldiversity.ummz.umich.edu/site/accounts/information/Spilogale_putorius.html
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Stefanie Pennington, Southwestern University
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Life Expectancy

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Average lifespan
Status: captivity:
10.0 years.

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Pennington, S. 2002. "Spilogale putorius" (On-line), Animal Diversity Web. Accessed April 27, 2013 at http://animaldiversity.ummz.umich.edu/site/accounts/information/Spilogale_putorius.html
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Stefanie Pennington, Southwestern University
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Morphology

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These skunks have large bodies that are low to the ground with a small tapered head. The nose is short and rounded. The head and body length is typically 115-345 mm and the tail length 70-220 mm. Males are slightly larger than females. Females have three pairs of teats for feeding young. The hair is longest on the tail and shortest on the head. As in all skunk species S. putorius has a well-developed pair of anal glands used in self-defense. They have 34 teeth. There is a small white spot on the forehead and one in front of each ear. There are six distinct white stripes on the anterior part of the body. The posterior part of the body has two interrupted white bands, and one spot on each side of the rump and two more at the base of the tail. There are five toes on each foot. The front claws are sharp and recurved, and are more than twice as long as the hind claws (Grzmek 1972, Nowk 1964, Davis and Schmidley 1994).

Range mass: 200 to 1000 g.

Other Physical Features: endothermic ; bilateral symmetry

Average basal metabolic rate: 1.674 W.

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Pennington, S. 2002. "Spilogale putorius" (On-line), Animal Diversity Web. Accessed April 27, 2013 at http://animaldiversity.ummz.umich.edu/site/accounts/information/Spilogale_putorius.html
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Stefanie Pennington, Southwestern University
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Reproduction

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Mating occurs in March and April, although in southern states some females may mate in July and August if they have not mated or lost their first litter. In some cases there have been females with two litters in one year. Males tend to wander and become more active during the mating season, and are know for a condition called "mating madness" in which they will spray any large animals that they encounter. In males, testes enlarge and testosterone levels increase throughout mating season, peaking in April, but maintaining these characteristics thoughout July if females are capable of a second litter. Courtship behaviors include a short chase ending with the male grabbing the female by the nape of her neck and with both sinking to their sides. Copulation usually lasts one minute and can be repeated 10-20 times. The gestation period is approximately 50-65 days with the litter size usually about 5-6. The young are born blind and helpless and their bodies are covered with a fine hair that already has distinct black and white markings. Their eyes open at 30-32 days and they begin to walk and play when 36 days old. Sexual maturity is reached at 11 months in both sexes. (Davis and Schmidley 1994, Grzmek 1972, Kaplan 1994)

Key Reproductive Features: gonochoric/gonochoristic/dioecious (sexes separate); sexual

Average birth mass: 9.5 g.

Average gestation period: 31 days.

Average number of offspring: 5.

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

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

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Pennington, S. 2002. "Spilogale putorius" (On-line), Animal Diversity Web. Accessed April 27, 2013 at http://animaldiversity.ummz.umich.edu/site/accounts/information/Spilogale_putorius.html
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Stefanie Pennington, Southwestern University
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Eastern spotted skunk

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Skull

The eastern spotted skunk (Spilogale putorius) is a small, relatively slender skunk found in North America, throughout the eastern United States and in small areas of Canada and Mexico.

This small skunk is more weasel-like in body shape than the more familiar striped skunk. The eastern spotted skunk has four stripes on its back[3] which are broken in pattern, giving it a "spotted" appearance. They have a white spot on their forehead. They are found in Canada (southeast Manitoba and northwestern Ontario), the United States and northeastern Mexico.[1] Males, at 46.3–68.8 cm (18.2–27.1 in) in total length, are larger than females, at 35–54.4 cm (13.8–21.4 in).[3] The tail accounts for roughly a third of their total length. Body mass can range from 0.2 to 1.8 kg (0.44 to 3.97 lb), with males averaging around 700 g (1.5 lb) against the female's average of 450 g (0.99 lb).[4] Skull length is 43–55 mm (1.7–2.2 in).[5] The eastern spotted skunk is a very small skunk, no larger than a good-sized tree squirrel.[3][6]

They are much more active than any other type of skunk. They have mostly the same predators as any other skunk (big cats, bobcats, owls, humans, etc.). Up to eight skunks may share an underground den in the winter. They can also climb and take shelter in trees.[7]

Eastern spotted skunks seem to prefer forest edges and upland prairie grasslands, especially where rock outcrops and shrub clumps are present. In western counties, it relies heavily on riparian corridors where woody shrubs and woodland edges are present. Woody fencerows, odd areas, and abandoned farm buildings are also important habitat for eastern spotted skunks.

Description

Pelt of Spilogale putorius

The eastern spotted skunk has a small weasel-like body with fine, dense black fur that has 4 to 6 broken, white stripes.[8] Two of the stripes are located at the median of the body and four stripes are placed on the side running from the back of the head to the rear. White markings are present on both cheeks, as well as on the tip of the tail. This is known as an aposematic fur pattern and is thought to act as a warning to predators.

The typical body length of eastern spotted skunks is 24 to 26 centimetres (9.4 to 10.2 in) with a tail length from 11 to 19 centimetres (4.3 to 7.5 in), resulting in a total length of 35 to 45 centimetres (14 to 18 in). The feet are 40 to 53 millimetres (1.6 to 2.1 in) long, and the forefeet have claws approximately 7 millimetres (0.28 in) long, while the hind feet have claws that are around 3.5 centimetres (1.4 in). The feet are equipped with pads on the soles that aid in climbing. The large claws of the forefeet help the skunk dig and grasp prey. The total body weight of adults ranges from 400 to 965 grams (14.1 to 34.0 oz).

Behavior

Eastern spotted skunks are quite secretive and crafty creatures, and it is a rarity for humans to see them. They are also nocturnal and tend to be more active during dry cool nights rather than warm wet nights. Although these skunks do not hibernate, they do tend to greatly reduce their activity when enduring intensely warm summers or very cold winters.[8] Generally speaking, out of the four species, S. putorius is the most active. They are also more agile and vigilant than the other skunks dwelling in North America.

In addition to performing a handstand before spraying a potential predator, the skunk also performs foot stamping, which involves the skunk stamping its feet on the ground in order to warn an approaching predator. The stamping can be heard for several meters away and is usually followed by the skunk spraying its odorous solution. When these skunks encounter an egg that they want to eat they will straddle the egg with their front legs and bite the egg open. If this fails they will then proceed to use their front legs to push the egg back and kick it with one of their hind legs.[8]

Breeding

Eastern spotted skunks usually breed in March or April and give birth in late May or early June.[9] On average the female skunk gives birth to 4–5 baby skunks (kits) at a time. It takes twelve weeks before newborn skunks will become fully developed into adult skunks and two months before they develop skunk musk to use as self-defense.

Conservation

The eastern spotted skunk has seen sharp declines in populations from several states, particularly those in the Midwest (such as Minnesota and Wisconsin). The exact reason behind the decrease in numbers is not known, which is puzzling considering the species was very quick to adapt to human settlement, and was commonly trapped up until the second half of the 20th century. Before then, they were frequently seen on farmlands, and were known to dig burrows under the sides of barns and prey on mice that were attracted to stored grains. In Minnesota, after a peak in the number of reported trapped specimen in 1949, during which over 19,400 spotted skunks were taken in that year alone, yearly reports of trapped spotted skunks in that state sharply fell in the following years. Pesticide use, modernization of farming techniques, over-trapping and consolidation of barns and other man-made structures are all believed to have had a negative effect on eastern spotted skunk populations; as a result, it has become possibly eradicated from several midwestern states, and on the whole is declining in that region. It is also declining in parts of the eastern US, such as Pennsylvania. Where it is not declining, the eastern spotted skunk is uncommon, although it remains common in Southern Florida.[10] According to a population survey done in Alabama, the Carolinas, and Virginia, the Appalachian spotted skunk (S. p. putorius), the nominate subspecies, underwent a decline of about 3% per year between 2014 and 2020, with about a 50% mortality rate; predation from owls constituted the main reason for mortality throughout most of the range, but in North Carolina, a canine distemper outbreak killed half the marked (and a few unmarked) individuals over a few days.[11]

References

  1. ^ a b Gompper, M.; Jachowski, D. (2016). "Spilogale putorius". IUCN Red List of Threatened Species. 2016: e.T41636A45211474. doi:10.2305/IUCN.UK.2016-1.RLTS.T41636A45211474.en. Retrieved 13 November 2021.
  2. ^ "NatureServe Explorer 2.0". explorer.natureserve.org. Retrieved 4 April 2022.
  3. ^ a b c John O. Whitaker Jr. (30 July 2010). Mammals of Indiana: A Field Guide. Indiana University Press. p. 1. ISBN 978-0-253-22213-8. Retrieved 23 November 2011.
  4. ^ "Species Information: Eastern spotted skunk (Spilogale putorius putorius)". Archived from the original on 2011-12-07. Retrieved 2012-04-02.
  5. ^ Hunter, Luke (2011). Carnivores of the World. Princeton University Press. ISBN 978-0-691-15228-8.
  6. ^ Jay Butfiloski; Tom Swaygnham. "Eastern Spotted Skunk" (PDF). www.dnr.sc.gov. Retrieved 30 December 2021.
  7. ^ Diggins, Corinne A.; Jachowski, David S.; Martin, Jay; Ford, W. Mark (2015). "Incidental Captures of Eastern Spotted Skunk in a High-Elevation Red Spruce forest in Virginia". Northeastern Naturalist. 22 (2): N6–N10. doi:10.1656/045.022.0211. S2CID 86148909.
  8. ^ a b c Bullock, Lindsay (December 2008). "Mammals of Mississippi". Department of Wildlife and Fisheries.
  9. ^ Kinlaw, Al (1995). "Spilogale putorius". Mammalian Species (511): 1–7. ISSN 0076-3519. JSTOR 3504212.
  10. ^ Gompper, M.; Hackett, H. (2005). "The long-term, range-wide decline of a once common carnivore: the eastern spotted skunk (Spilogale putorius)". Animal Conservation. Wiley. 8 (2): 195–201. doi:10.1017/S1367943005001964. ISSN 1367-9430. S2CID 20413459.
  11. ^ "TWS2021: Disease, predation causing Appalachian spotted skunk decline - The Wildlife Society". Wildlife.org. 2021-11-18. Retrieved 2021-11-27.

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Eastern spotted skunk: Brief Summary

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Skull

The eastern spotted skunk (Spilogale putorius) is a small, relatively slender skunk found in North America, throughout the eastern United States and in small areas of Canada and Mexico.

This small skunk is more weasel-like in body shape than the more familiar striped skunk. The eastern spotted skunk has four stripes on its back which are broken in pattern, giving it a "spotted" appearance. They have a white spot on their forehead. They are found in Canada (southeast Manitoba and northwestern Ontario), the United States and northeastern Mexico. Males, at 46.3–68.8 cm (18.2–27.1 in) in total length, are larger than females, at 35–54.4 cm (13.8–21.4 in). The tail accounts for roughly a third of their total length. Body mass can range from 0.2 to 1.8 kg (0.44 to 3.97 lb), with males averaging around 700 g (1.5 lb) against the female's average of 450 g (0.99 lb). Skull length is 43–55 mm (1.7–2.2 in). The eastern spotted skunk is a very small skunk, no larger than a good-sized tree squirrel.

They are much more active than any other type of skunk. They have mostly the same predators as any other skunk (big cats, bobcats, owls, humans, etc.). Up to eight skunks may share an underground den in the winter. They can also climb and take shelter in trees.

Eastern spotted skunks seem to prefer forest edges and upland prairie grasslands, especially where rock outcrops and shrub clumps are present. In western counties, it relies heavily on riparian corridors where woody shrubs and woodland edges are present. Woody fencerows, odd areas, and abandoned farm buildings are also important habitat for eastern spotted skunks.

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