鸟是两足、恒温、卵生的脊椎动物,身披羽毛,前肢演化成翅膀,具有坚硬的喙。鸟纲在生物分类学上是脊椎动物亚门下的一个纲。因其身体被羽毛覆盖,中国古代动物学将其统称为羽蟲。
You can copy this taxon into another guide. If you are one of the editors of this guide it should copy everything, but if you're not, it will only copy the licensed content.
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