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The great reed warblers' responses to the common cuckoo eggs varied: 66% accepted the egg(s); 12% ejected them; 20% abandoned the nests entirely; 2% buried the eggs. 28% of the cuckoo eggs were described as "almost perfect" in their mimesis of the host eggs, and the warblers rejected "poorly mimetic" cuckoo eggs more often.
The cuckoo egg hatches earlier than the host eggs, and the cuckoo chick grows faster; in most cases, the chick evicts the eggs and/or young of the host species. The chick has no time to learn this behavior, nor does any parent stay around to teach it, so it must be an instinct passed on genetically. Reed warbler raising the young of a common cuckoo
The female cuckoo in each case replaces one of the host's eggs with one of her own. The cuckoo egg hatches earlier than the host's, and the chick grows faster; in most cases the cuckoo chick evicts the eggs or young of the host species. Cuculus species lay coloured eggs to match those of their passerine hosts. Female cuckoos specialise in a ...
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.
Both the male and the female take part in nest building. They lay 2 to 4 eggs that hatch after 15–16 days of incubation. The chicks take 18–22 days to fledge. A study in southern India found that 77% of the eggs hatched and 67% fledged. Nests with eggs were sometimes abandoned or marauded by the Indian jungle crow Corvus macrorhynchos ...
The entire time from egg-laying to fledging may be as little as 17 days. Yellow-billed cuckoos occasionally lay eggs in the nests of other birds (most often the closely related black-billed cuckoo), but they are not obligate brood parasites of other birds as is the common cuckoo of Eurasia.
The red-chested cuckoo is a medium-size cuckoo about 31 cm (12.2 in) in length. The male has slate-grey upper parts, pale grey throat and sides of head and dark grey tail tipped with white. The breast is rufous or cinnamon, often with barring, and the belly is creamy-white or pale buff.
The female cuckoo lays one, sometimes two, white or bluish eggs in the host's large stick nest. The eggs hatch in 15 days, with a further 18 days until the cuckoo fledges. The young spinetails disappear. This species is about 27 cm (11 in) long and weighs 40 g (1.4 oz). The adult is mainly grey-brown above, streaked with black and buff.
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