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The presence of other parakeets encourages a pair to breed, which is why breeding in a group is better. Despite this, many breeders choose to breed in pairs to both avoid conflicts and know offspring's parentage with certainty. Budgerigars lay an average of 4-6 eggs, while other parakeet species may lay an average of 4-6 eggs. [citation needed]
The eggs are typically one to two centimetres long and are pearl white without any colouration if fertile. Female budgerigars can lay eggs without a male partner, but these unfertilised eggs will not hatch. Females normally have a whitish tan cere; however, when the female is laying eggs, her cere turns a crusty brown colour.
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.
Egg laying takes place from November to January, peaking in December. On average, clutches count 7 eggs, yet can range from 4 to 9. Eggs look oval and white with a slight gloss which fades during incubation. In red-crowned parakeets, only the female incubates. While in the nest, they are seen turning their eggs regularly.
Most fish species spawn eggs that are fertilized externally, typically with the male inseminating the eggs after the female lays them. These eggs do not have a shell and would dry out in the air. Even air-breathing amphibians lay their eggs in water, or in protective foam as with the Coast foam-nest treefrog, Chiromantis xerampelina.
Most Amphibians are oviparous and lay their eggs in water, though some have adapted to lay them on land. [7] There are also some species that are viviparous, giving birth to live young. [8] Eggs can be fertilized either internally or externally depending on the species. [7]
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.