鸭嘴兽是最原始的哺乳动物之一,它是未完全进化的哺乳动物,种类极少,同属之中只有鸭嘴兽一种动物,也是最低等的哺乳动物之一 [1] ;18世纪后期,乔治·肖收到鸭嘴兽标本,以为这种生物是恶作剧的产物,后于1799年命名。鸭嘴兽嘴和脚像鸭子,而身体和尾部像海狸。2500万年前就已出现,至今仍生活在澳大利亚。 [2] 由于鸭嘴兽数量较少且分布较小,故暂未发现亚种。
2019年2月,**湖北地区首次发现了2个与现生鸭嘴兽具有相似捕食方式的海生爬行动物化石
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