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beak
The beak, bill, or rostrum is an external anatomical structure of birds which is used for eating and for grooming, manipulating objects, killing prey, fighting, probing for food, courtship and feeding young. The terms ''beak'' and ''rostrum'' are also used to refer to a similar mouthpart in some Ornithischian dinosaurs, monotremes, cephalopods (see Cephalopod beak), cetaceans, billfishes, pufferfishes, turtles, Anuran tadpoles and sirens.
Although beaks vary significantly in size, shape, color and texture, they share a similar underlying structure. Two bony projections—the upper and lower mandibles—are covered with a thin keratinized layer of epidermis known as the rhamphotheca. In most species, two holes known as nares lead to the respiratory system.
==Etymology==
Although the word 'beak' was, in the past, generally restricted to the sharpened bills of birds of prey,〔 in modern ornithology, the terms 'beak' and 'bill' are generally considered to be synonymous.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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