

A rooster can and will crow at any time of the day. However, while many roosters crow shortly after waking up, this idea is not exactly true. The rooster is often portrayed as crowing at the break of dawn ("cock-a-doodle-doo"). Although it is possible for a hen to crow as well, crowing (together with hackles development) is one of the clearest signs of being a rooster. Roosters almost always start crowing before four months of age. (The term "cock" is also used generally to refer to a male of other species of bird, for example the "Cock sparrow", or to the human male genitalia.) He sounds a distinctive alarm call if predators are nearby and will frequently crow to assert his territory. During the daytime, a rooster often sits on a high perch, usually 0.9 to 1.5 m (3 to 5 feet) off the ground, to serve as a lookout for his group (hence the term "rooster"). He guards the general area where his hens are nesting, and attacks other roosters that enter his territory. The rooster is polygamous, but cannot guard several nests of eggs at once. "Roosting" is the action of perching aloft to sleep at day, which is done by both sexes.

The older terms "cock" or "cockerel", the latter denoting a young cock, are used in the United Kingdom and Ireland. The term "rooster" originates in the United States, and the term is widely used throughout North America, as well as Australia and New Zealand. Mature male chickens less than one year old are called cockerels. A rooster, also known as a cockerel or cock, is a male gallinaceous bird, usually a male chicken (Gallus gallus).
