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The eggs incubate for approximately 23–24 days before hatching. In their Afghanistan range, this bird will often nest in abandoned nest cavities of the scaly-bellied woodpecker, and these species may nest in close proximity to each other for security against predators. The slaty-headed parakeet usually breeds within the months of March–May.
Humans have a long history of eating eggs, both wild bird eggs and farm-raised bird eggs. [citation needed] Brood parasitism occurs in birds when one species lays its eggs in the nest of another. In some cases, the host's eggs are removed or eaten by the female, or expelled by her chick.
The white-winged parakeet usually finds a hole in a tree in which to nest. It may also take over termite tunnels and excavate them for their own purposes. Clutches usually consist of three to five white eggs, which hatch after about 26 days of incubation. Young fledge between six and seven weeks of age, and are fully weaned around nine weeks.
The breeding season begins in September, and eggs are laid up to December, with two up to five eggs laid per clutch. [2] The incubation period is 24–25 days, where the female is the sole incubator while the male provides for her. [18] Eggs hatch asynchronously, and mortality is higher for fourth and fifth chicks in a clutch. [18]
The plain parakeet's breeding season is believed to be from September to December but possibly begins earlier and ends later. It nests in cavities in trees. In captivity the clutch size is four eggs, the incubation period about 26 days, and fledging at seven weeks after hatch. [8
The only living mammals that lay eggs are echidnas and platypuses. In the latter, the eggs develop in utero for about 28 days, with only about 10 days of external incubation (in contrast to a chicken egg, which spends about one day in tract and 21 days externally). [11] After laying her eggs, the female curls around them.
Eggs are generally laid on a bed of decayed wood at the bottom of the tree hollow. The Bourke's parrot has a clutch of 3 to 6 eggs, which are incubated by the female for 18–19 days. During this period, she is fed by the male parrot, only leaving the nest to find water or to defecate. Once the chicks hatch, both parents feed their young.
Nothing is known about the white-eared parakeet's breeding biology in the wild. In captivity it lays a clutch of five to nine eggs; the female alone incubates for 27 days and fledging occurs about five weeks after hatch. [5