鳥類(鳥群)で最古の化石は、中国の髫髻山層で発見されたもので、約1億6千万年前のジュラ紀後期(オックスフォーディアン)に遡る。 当時の種類には、Anchiornis huxleyi、Xiaotingia zhengi、およびAurornis xui などがある。

夜の鳥 ⇒ ムクドリ大~カラス大(ヨタカ、フクロウのなかま)の鳥を見る. 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