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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.
The incubator is recorded being used to hatch bird and reptile eggs. It lets the fetus inside the egg grow without the mother needing to be present to provide the warmth. Chicken eggs are recorded to hatch after about 21 days, but other species of birds can take a longer or shorter amount of time. [10] Incubators are also used to raise birds. [11]
Fertile chicken eggs hatch at the end of the incubation period, about 21 days; the chick uses its egg tooth to break out of the shell. [34] Hens remain on the nest for about two days after the first chick hatches; during this time the newly hatched chicks feed by absorbing the internal yolk sac. [42]
Whale shark eggs typically hatch within the mother. At 1.5 kg (3.3 lb) and up to 17.8 cm × 14 cm (7.0 in × 5.5 in), the ostrich egg is the largest egg of any living bird, [ 2 ] : 130 though the extinct elephant bird and some non-avian dinosaurs laid larger eggs.
This method works for hatching eggs from sex-linked breeds where male and female birds have different color plumage, all males white-feathered and all females brown-feathered for example, [38] and can take place from the 13th day of the hatching process. [39] AAT's goal is to eventually be able to sex eggs at the 4th day. [34]
The female incubates the eggs for 11–14 days before they hatch. Then the female feeds the offspring while the male teaches them to fly and leave the nest, usually within 18 days of birth. The male also feeds the offspring a little less than half the time, easing the burden on the female.