The calls of the Great Spotted Cuckoo are loud, grating, and assorted. These birds are noisiest when they first arrive at their final destinations during breeding season. This is most evident in Zimbabwe, South Africa, and Namibia. Their clamor lessens as the season progresses. Their most familiar cry is keeeow keeeow keeeow. This may be used to attract females. However, the female produces a bubbling or chuckling sound burroo, burroo. Both the male and female produce a high pitched alarm note chick-chick-chick. When harassed, C. glandarius generate a great variety of clucks, croaks, grunts, chattering, and quacking sounds in shorts bursts (Rowan, 1983). Futhermore, in Zimbabwe, the Great Spotted Cuckoo is one of several supposed rain birds. Its calling has been said to be a sign that rain will fall (Rowan, 1983).
Perception Channels: visual ; tactile ; acoustic ; chemical
C. glandarius is gernerally unobservable and rare throughout the majority of its range. Nevertheless, in the larger areas it inhabits, it can be seen frequently. The species population is expanding in South Europe and the Middle East; however, it is decreasing in Egypt where it is now rare as a breeding bird. The Great Spotted Cuckoo has also disappeared as a breeder in North West Africa (Payne, 1997).
IUCN Red List of Threatened Species: least concern
The Great Spotted Cuckoo has affected the success of magpie chicks in a parasitized nest. The magpie chicks grow more slowly and fledge at lower weights (Payne, 1997). C. glandarius may also harm some of the other species whose nests it occupies.
The Great Spotted Cuckoo is not generally recognized as having any positive economic importance. However, it is possible that its consumption of caterpillars may reduce the amount of crop pests destroying fields and produce.
C. glandarius are exclusively insectivores. Their diet consists of mainly hairy or spiny caterpillars. The caterpillars are dressed by removing their hairs before consumption. Additionally, these cuckoos eat some termites, grasshoppers, moths, and lizards (Payne, 1997). The Great Spotted Cuckoo generally feeds on the ground. They ordinarily hop through the foliage with their tails raised searching intently for prey. Periodically, they make long bounds while hunting and flutter in pursuit of fast moving victims (Rowan, 1983).
The Great Spotted Cuckoo extend throughout Southern Europe and Africa. They are distributed through east Africa to Somalia, Sudan and Senegal, Mediterranean Africa, Asia Minor and parts of Mediterranean Europe (chiefly Spain) (Cramp, 1985).
Biogeographic Regions: palearctic (Native ); ethiopian (Native )
The natural habitat of the Great Spotted Cuckoo is woodland or savanna. They are usually observed in semi-arid areas, rocky hillsides, dry cultivation (Middle East), or among scattered trees in open country (Europe). (Maclean, 1985, Payne, 1997).
Terrestrial Biomes: forest
Length: 37-40 cm (Maclean, 1985) The top of the head and crest are pale, silvery gray and blend gradually into pale grayish or olive brown on the back and wings. The wings are long and wide at the base. The dorsal surface has a spotted appearance due to white tipped wing coverts and back feathers. The long tail feathers are a dark gray, broadly tipped with white. The primaries are a dark, olive-brown and have a metallic luster. The throat, neck, and underparts are a creamy-white (Rowan, 1983). The bill is a dark bluish-gray to black and is paler on the basal half of the lower mandible. It is wide at the base and has slit-like nostrils. The iris is colored brown and is encircled with a bright, red eye-ring. The legs and toes are tinted leaden gray (Cramp, 1985).
There is some geographic variation in size. Birds located in the Middle East are similar in size to those of Egypt. However, C. glandarius in Spain, Portugal, and Northwest Africa display a slightly shorter wing and tail span. Furthermore, populations breeding in the northern region of South Africa through Tanzania are the smallest in all measurements (Cramp, 1985).
Other Physical Features: endothermic ; bilateral symmetry
Breeding: During the early summer, male and female C. glandarius can be seen flying and foraging together, often chasing each other and frequently exchanging calls. These calls consist of a chattering sound proceeded by a rolling noise (Cramp, 1985). Their calling wanes during the breeding season which, over most of their range, is restricted to the four months, October through January (Rowan, 1983). Breeding peaks in October in Zimbabwe, November/December in Natal, and not until February in Namibia. The male usually arrives first at the breeding grounds. The birds regularly form pairs and are usually monogamous; however, in occasional instances various males have selected the same female. Monogamous pairs in captivity form a pair-bond and accompany each other constantly. They are seen perched side by side, where they frequently touch bills and call softly to each other (Cramp, 1985).
Courtship and Copulation:
Courtship is performed by feeding and invariably accompanies copulation. The male finds an insect such as a caterpillar, grasshopper, or moth, and then mounts the receptive female (Rowan, 1983). The female indicates her interest by rhythmically jerking her body while keeping her wings closed. The female then grasps the food in her bill as the male bends his head downward. Both birds maintain a grip on the prey, which balances the male. The male settles low on the female and clutches both sides of her body with his legs. Copulation can last up to two minutes. When copulation is successfully completed, the insect is relinquished to the female (Cramp, 1985).
Egg Laying:
The Great Spotted Cuckoo is parasitic and usually chooses to lay its eggs in the nest of the Pied Crow. However, cuckoos make use of open and hole nesting starlings, especially in Somalia, Sudan, and Zambia (Rowan, 1983). Before the female lays her eggs, she takes the initiative and searches for a host's nest. Once the host's nest is chosen, the male may assist in distracting the host. The pair often distracts by loud calling. In some cases, the male approaches the host's nest conspicuously, calling as it flies from bush to bush. The female can then make a silent advance into the nest under the cover of vegetation. The female has been observed to lay her eggs while sitting on the nest rim. She often removes an egg of the host when depositing her own or damages it cracking or holing the shell. The female can lay as many as 13 eggs in one nest, and 15-25 eggs in one season (Cramp, 1985). The incubation period is about 12-15 days and is four to five days shorter than its host. After hatching, the young C. glandarius grows up and is cared for by its host (Payne, 1997). It remains in the nest for approximately 18 days (Friedman, 1948).
Key Reproductive Features: iteroparous ; gonochoric/gonochoristic/dioecious (sexes separate); sexual ; oviparous
Migrant breeder and regular passage visitor.
The great spotted cuckoo (Clamator glandarius) is a member of the cuckoo order of birds, the Cuculiformes, which also includes the roadrunners, the anis and the coucals.
It is widely spread throughout Africa and the Mediterranean Basin. It is a brood parasite that lays its eggs in the nests of corvids, in particular the Eurasian magpie.
In 1747 the English naturalist George Edwards included an illustration and a description of the great spotted cuckoo in the second volume of his A Natural History of Uncommon Birds. He used the English name "The Great Spotted Cuckow". Edwards based his hand-coloured etching on a specimen that had been shot in Gibraltar and sent to the English naturalist Mark Catesby in London.[2] When in 1758 the Swedish naturalist Carl Linnaeus updated his Systema Naturae for the tenth edition, he placed the great spotted cuckoo with the other cuckoos in the genus Cuculus. Linnaeus included a brief description, coined the binomial name Cuculus glandarius and cited Edwards' work.[3] The great spotted cuckoo is now placed in the genus Clamator that was introduced by German naturalist Johann Jakob Kaup in 1829.[4][5] The species is monotypic: no subspecies are recognised.[5] The genus name Clamator is Latin for "shouter" from clamare, "to shout". The specific epithet glandarius is Latin meaning "of acorns".[6]
This species is slightly larger than the common cuckoo at 35–39 cm (14–15 in) in length, but looks much larger with its broad wings and long narrow tail. The adult is grey above with a slender body, long tail and strong legs. It has a grey cap, grey wings, a yellowish face and upper breast, and white underparts. Sexes are similar. The juveniles have blackish upperparts and cap, and chestnut primary wing feathers. This species has a magpie-like flight.
It is a bird of warm open country with trees. It feeds on insects, spiders, small reptiles and hairy caterpillars, which are distasteful to many birds.
The great spotted cuckoo's call is a loud cher-cher-kri-kri and variations.
Unlike the common cuckoo, neither the hen nor the hatched chick of this species evict the host's eggs, but the young magpies often die because they cannot compete successfully with the cuckoo for food. However it has been shown that this species' chicks secrete a repellent scent when predators threaten. The repellent protects great spotted cuckoo chicks themselves as well as the host's chicks from predators.[7] Carrion crow (Corvus corone corone) chicks survive better if a great spotted cuckoo chick shares their nest. Birds of prey and feral cats less frequently prey on crow's nests that include a great spotted cuckoo chick. Crow chicks benefit only when predators are very active; when there is less predation, losing food to great spotted cuckoo chicks harms the crow chicks without compensation.[8][9]
The great spotted cuckoo (Clamator glandarius) is a member of the cuckoo order of birds, the Cuculiformes, which also includes the roadrunners, the anis and the coucals.
It is widely spread throughout Africa and the Mediterranean Basin. It is a brood parasite that lays its eggs in the nests of corvids, in particular the Eurasian magpie.
