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[[File:鳥.jpg | thumb | 300px | 鳥 <br> [https://https://www.nownews.com/news/20190704/3482014/ 原圖鏈接] ]]
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'''鸟類'''是[[两足]]、[[恆溫動物|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 (生物)|纲]]。因其身体被羽毛覆盖，中国古代动物学将其统称为'''羽蟲'''。