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The genus name combines the Ancient Greek kallos meaning "beauty" and kephalē meaning "head". [7] The species is monotypic: no subspecies are recognised. [5] The classification of the gang-gang cockatoo has always been controversial due to the unusual appearance and coloration of the bird, especially its sexual dichromatism.
Eggs of various animals (mainly birds) Oviparous animals are animals that reproduce by depositing fertilized zygotes outside the body (known as laying or spawning ) in metabolically independent incubation organs known as eggs , which nurture the embryo into moving offsprings known as hatchlings with little or no embryonic development within the ...
The female ostriches will lay their eggs at the same time, leading to having too many eggs in the nest. [2] The major hen is able to detect which eggs belong to her, and will push the other eggs to the perimeter of the nest, which is not looked after. This adaption of abandoning these eggs protects the well-kept eggs from predators. [2]
Typically, they lay 2–4 eggs in with those already present. The eggs of both the host and the victim are white, although the indigobird's are slightly larger. Many of the indigo-plumaged species named "indigobirds" are very similar in appearance, with the males difficult to separate in the field, and the young and females near impossible.
While a single specific cause is unknown, chronic egg laying is believed to be triggered by hormonal imbalances influenced by a series of external factors. [1] As in the domestic chicken, female parrots are capable of producing eggs without the involvement of a male – it is a biological process that may be triggered by environmental cues such as day length (days becoming longer, indicating ...
The female lays clutches of eggs from February through August, two or more broods per year with 2 to 6 eggs per brood, most commonly 4 or 5. The egg laying usually takes place in the morning, at one egg per day. [17] The eggs are pale bluish-green with few black spots and a smooth, somewhat glossy surface.
Birds of a pair copulate frequently until the female is laying eggs, and the male mounts the female repeatedly each time a pair mates. [133] The house sparrow is monogamous, and typically mates for life, but birds from pairs often engage in extra-pair copulations, so about 15% of house sparrow fledglings are unrelated to their mother's mate. [136]
The male finishes the nest only after finding a mate. The female lays about two to four white eggs and incubates them for about 14 to 17 days. [40] Males may sometimes assist in feeding the chicks. The chicks leave the nest after about 17 days. [16] After mating with a female the male typically court other females at other partially constructed ...