因其嘴巴的形状而得名的鸭嘴兽是世界上最古老的哺乳动物之一。
The platypus, also known as duckbill for the shape of its mouth, is one of the oldest animals in the world.
其中一些最古老的动物属于哺乳动物，比今天在澳大利亚发现的任何哺乳动物都要大得多。
Some of the oldest belonged to mammals far larger than any found today in Australia.
从一个古代北极熊颚骨上测得的最古老哺乳动物基因组，为动物与气候的紧密相关提供了线索。
The sequencing of the oldest mammalian genome from an ancient polar bear jawbone provides clues about these.
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