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A rooster, also known as a cockerel or cock, is a male gallinaceous bird, usually a male chicken (''Gallus gallus''). Mature male chickens less than one year old are called cockerels. The term "rooster" originates in the United States,〔(Hugh Rawson ) "Why Do We Say...? Rooster", ''American Heritage'', Aug./Sept. 2006.〕 and the term is widely used throughout North America, as well as Australia and New Zealand.〔; , though the results for "Rooster" are heavily affected by a rugby team of that name.〕 The older terms "cock" or "cockerel", the latter denoting a young cock, are used in the United Kingdom and Ireland.〔(poultry.ie )〕 "Roosting" is the action of perching aloft to sleep at day, which is done by both sexes. The rooster is polygamous, but cannot guard several nests of eggs at once. He guards the general area where his hens are nesting, and will attack other roosters that enter his territory. During the daytime, a rooster will often sit on a high perch, usually off the ground, to serve as a lookout for his group. He will sound a distinctive alarm call if predators are nearby. (The term "cock" is also used generally to refer to a male of other species of bird, for example "Cock sparrow".) ==Crowing== right Roosters almost always start crowing before four months of age. 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. The rooster is often portrayed as crowing at the break of dawn ("cock-a-doodle-doo"). However, this idea is more romantic than real, as a rooster can and will crow at any time of the day. Some roosters are especially vociferous, crowing almost constantly, while others only crow a few times a day. These differences are dependent both upon the rooster's breed and individual personality. A rooster can often be seen sitting on fence posts or other objects, where he crows to proclaim his territory. Roosters have several other calls as well, and can cluck, similar to the hen. Roosters occasionally make a patterned series of clucks to attract hens to a source of food, the same way a mother hen does for her chicks. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「rooster」の詳細全文を読む スポンサード リンク
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