Search results
Results from the WOW.Com Content Network
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.
Castrated males can go broody with baby chicks, [8] showing that broodiness is not limited to females, however, castrated males do not incubate eggs. Contrary to common opinion, the temperature of broody hens barely differs from that of laying hens. [8] Broody hens pluck feathers from their chest, using them to cover the eggs.
No nest material is added, although litter may build up over the years. Both parents incubate the eggs and feed the chicks. Egg laying is staggered at one-day intervals so that if food is short, only the older, larger nestlings get fed. The chicks are naked, blind, and helpless when they hatch, and stand on their heels, unlike adults. [7]
Deep cup nest of the great reed-warbler. A bird nest is the spot in which a bird lays and incubates its eggs and raises its young. Although the term popularly refers to a specific structure made by the bird itself—such as the grassy cup nest of the American robin or Eurasian blackbird, or the elaborately woven hanging nest of the Montezuma oropendola or the village weaver—that is too ...
Birds which build in trees generally have blue or greenish eggs, either spotted or unspotted, while birds that build in bushes or near or on the ground are likely to lay speckled eggs. The color of individual eggs is also genetically influenced, and appears to be inherited through the mother only, suggesting the gene responsible for ...
Temperature-dependent sex determination was first described in Agama agama in 1966 by Madeleine Charnier. [18] A 2015 study found that hot temperatures altered the expression of the sex chromosomes in Australia's bearded dragon lizards. The lizards were female in appearance and were capable of bearing offspring, despite having the ZZ ...
Horror, but no surprise, was my reaction when I first read of the undercover video shot at an Iowa hatchery, where day-old male chicks are sent, alive, through a grinder.Their sisters are destined ...
This means the cuckoo chick can hatch before the host's chicks do, and it can eject the unhatched eggs from the nest. Scientists incubated common cuckoo eggs for 24 hours at the bird's body temperature of 40 °C (104 °F), and examined the embryos, which were found "much more advanced" than those of other species studied.