直到最近在分类学上，鸟的定义是一只有羽毛的动物。
Taxonomically, the very definition of a bird was until recently an animal that has feathers.
鸟- - - - -一种动物长有翅膀并且浑身被羽毛覆盖，而且会飞。
"Bird" — a creature with wings and feathers that can usually fly.
鸟- - - - -一种动物长有翅膀并且浑身被羽毛覆盖，而且会飞。
"Bird" — a creature with wings and feathers that can usually fly.
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