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During the laying period, red junglefowl females lay an egg every day. Eggs take 21 days to develop. Chicks fledge in about 4 to 5 weeks, and at 12 weeks old they are chased out of the group by their mother — at which point they start a new group or join an existing one.
Junglefowl are the only four living species of bird from the genus Gallus in the bird order Galliformes, and occur in parts of South and Southeast Asia.One of the species in this genus, the red junglefowl, is of historical importance as the direct ancestor of the domestic chicken, although the grey junglefowl, Sri Lankan junglefowl and green junglefowl are likely to have also been involved. [2]
Brood parasitism, laying eggs in the nests of birds of other species, happens in types of birds that are not closely related. [114] The charadriiform buttonquails closely resemble the galliform quails. Gallopheasants and junglefowl have similar tail-feathers but evolved them independently.
Backcrossing of many generations of the hybrid Bekisar males with feral domestic game hens must occur before fertile females are produced. Female hybrid offspring of green junglefowl crossed with domestic fowl are always sterile, laying eggs that are incapable of being fertilized by either green or red junglefowl, or by domestic fowl.
The first amniote egg – that is, a hard-shelled egg that could be laid on land, rather than remaining in water like the eggs of fish or amphibians – appeared around 312 million years ago. [6] In contrast, chickens are domesticated descendants of red junglefowl and probably arose little more than eight thousand years ago, at most. [7]
The chicken (Gallus gallus domesticus) is a large and round short-winged bird, domesticated from the red junglefowl of Southeast Asia around 8,000 years ago. Most chickens are raised for food, providing meat and eggs; others are kept as pets [1] or for cockfighting.
Chickens and dogs aren't the most natural pairing. Although they surely do live together from time to time. Just take the testy way that a chicken named Popcorn reacted to its dog brother.
Monotremes, egg-laying mammals, lay soft-shelled eggs similar to those of reptiles. The shell is deposited on the egg in layers within the uterus. The egg can take up fluids and grow in size during this process, and the final, most rigid layer is not added until the egg is full-size. [citation needed]