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As the common cuckoo evolves to lay eggs that better imitate the host's eggs, the host species adapts and is more able to distinguish the cuckoo egg. A study of 248 common cuckoo and host eggs demonstrated that female cuckoos that parasitised common redstart nests laid eggs that matched better than those that targeted dunnocks.
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 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.
Levaillant's cuckoo: Clamator levaillantii (Swainson, 1829) 76 Jacobin cuckoo: Clamator jacobinus (Boddaert, 1783) 77 Little cuckoo: Coccycua minuta (Vieillot, 1817) 78 Dwarf cuckoo: Coccycua pumila (Strickland, 1852) 79 Ash-colored cuckoo: Coccycua cinerea (Vieillot, 1817) 80 Squirrel cuckoo: Piaya cayana (Linnaeus, 1766) 81 Black-bellied cuckoo
The gapes of juvenile altricial birds are often brightly coloured, as in this common starling. In bird anatomy, the gape is the interior of the open mouth of a bird, and the gape flange is the region where the two mandibles join together at the base of the beak. [33] The width of the gape can be a factor in the choice of food. [34]
The Asian koel is a large and long-tailed cuckoo measuring 39–46 cm (15–18 in) and weighing 190–327 g (6.7–11.5 oz). [18] [19] The male of the nominate race is glossy bluish-black, with a pale greenish grey bill, the iris is crimson, and it has grey legs and feet. The female of the nominate race is brownish on the crown and has rufous ...
Yellow-billed and black-billed cuckoos occasionally lay eggs in the nests of other birds, but are not obligate brood parasites like the common cuckoo of Eurasia. Northern species such as yellow-billed and black-billed cuckoos are strong migrants , wintering in Central or South America , and occasionally wander to western Europe as rare vagrants ...
A coucal is one of about 30 species of birds in the cuckoo family.All of them belong in the subfamily Centropodinae and the genus Centropus.Unlike many Old World cuckoos, coucals are not brood parasites, though they do have their own reproductive peculiarity: all members of the genus are (to varying degrees) sex-role reversed, so that the smaller male provides most of the parental care.