鸟类的演化始于侏罗纪时期,最早的鸟类源自名为近鸟类兽脚亚目恐龙演化支[1] 侏罗纪晚期的印石板始祖鸟被认为是最早的鸟类。在6600万年前的大灭绝事件中,至少有四支不同的鸟类幸存下来,分别是古颚类鸵鸟及其近亲)、齿雁类鸭子及其近亲)、泛鸡形类及其近亲)和新鸟小纲(其他鸟类)。

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