Beak

A gull's upper mandible can flex upwards because it is supported by small bones which can move slightly backwards and forwards.

Position of vomer (shaded red) in neognathae (left) and paleognathae (right)

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.

单词	gnathotheca
释义	gnathotheca 英汉-汉英词典 n. (鸟)下嘴鞘词组 \| 习惯用语您要查找的是不是： decathlon n. 十项运动 prognathous adj. 下巴突出的网络短语: gnathotheca 下嘴鞘英语百科 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.
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gnathotheca

您要查找的是不是：

网络短语:

Beak