An extinct primitive bird(genus Archaeopteryx) of the Jurassic period,having lizardlike characteristics,such as teeth and a long,bony tail. It may represent a transitional form between reptiles and birds.

• 始祖鸟已灭绝的侏罗纪时期原始鸟类（始祖鸟目属），具有类似麻雀的特征，如牙齿及长而多骨的尾巴。它可能代表了爬行动物与鸟类间的转变形式。