世界上大约生活着150多万种动物。动物身上大都长有一条尾巴,它们的尾巴形状各异,很有功夫。鸟把尾巴当作飞行器:鸟的尾巴上,长着又长又宽的羽毛,这些羽毛展开时好像扇子,能够灵活转动,便于掌握飞行方向。鸟尾在飞行时起着舵(duò)的作用。 There are more than 1.5 million animals in the world. Most animals have a long tail, their tail shapes vary, great effort. The bird uses the tail as an aircraft: the tail of a bird has long, wide feathers that unfold like a fan when it unfolds, allowing it to flexibly move in order to grasp the direction of flight. The bird's tail plays the role of duò in flight.