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鳥類（英語：bird）是鸟纲（学名：Aves）下属的所有四足类脊椎动物的通称，是唯一存活並演化至今的鳥翼類恐龙（学名：Avialae，即“鸟形恐龙”），其全体成员均为恒温、卵生、身披色彩鮮艷各異的羽...