Radiocarbon dating of blackened grains from the site
Originally raised for cockfighting or for special ceremonies, chickens were not kept for food until the Hellenistic period (4th–2nd centuries BC).
but with the clade found in the Americas, Europe, the Middle East and Africa originating in the Indian subcontinent.
In the UK and Ireland, adult male chickens over the age of one year are primarily known as cocks, whereas in the United States, Canada, Australia and New Zealand, they are more commonly called roosters. although in the egg-laying industry, a pullet becomes a hen when she begins to lay eggs, at 16 to 20 weeks of age.
In Australia and New Zealand (also sometimes in Britain), there is a generic term chook The species as a whole was then called domestic fowl, or just fowl.
He does this by clucking in a high pitch as well as picking up and dropping the food. Hens will often express a preference to lay in the same location.
This behaviour may also be observed in mother hens to call their chicks and encourage them to eat. It is not unknown for two (or more) hens to try to share the same nest at the same time.
Chickens are gregarious birds and live together in flocks.
They have a communal approach to the incubation of eggs and raising of young.
However, other breeds, such as the Cochin, Cornish and Silkie, do regularly go broody, and they make excellent mothers, not only for chicken eggs but also for those of other species—even those with much smaller or larger eggs and different incubation periods, such as quail, pheasants, turkeys or geese.However, in some breeds, such as the Sebright chicken, the rooster has only slightly pointed neck feathers, the same colour as the hen's.The identification can be made by looking at the comb, or eventually from the development of spurs on the male's legs (in a few breeds and in certain hybrids, the male and female chicks may be differentiated by colour).This use of "chicken" survives in the phrase "Hen and Chickens", sometimes used as a British public house or theatre name, and to name groups of one large and many small rocks or islands in the sea (see for example Hen and Chicken Islands).The word "chicken" is sometimes erroneously construed to mean females exclusively, despite the term "hen" for females being in wide circulation, and the term “rooster” for males being that most commonly used.