Taxonomically, the very definition of a bird was until recently an animal that has feathers.
直到最近在分类学上，鸟的定义是一只有羽毛的动物。
Out of animal skin and bird feathers.
用动物皮和鸟毛来做。
The bird has a tuft of red feathers on top of its head.
这只鸟的头顶上有一小簇红色的羽毛。
The feathers of the bird are blue.
这只鸟的羽毛是蓝色的。
The feathers of the bird are blue.
这只鸟的羽毛是蓝色的。
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