Pakicetus probably detected sound through the ear opening as in land mammals.

巴基鲸可能是通过像陆地哺乳动物一样的耳朵的开口来探测声音。

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Missing until recently were fossils clearly intermediate, or transitional, between land mammals and cetaceans.

直到最近才发现的化石，显然是介于陆地哺乳动物和鲸类之间的过渡物种。

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African elephants are the largest of Earth's land mammals.

非洲象是地球上最大的陆生哺乳动物。

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For many, however, this is a hot topic as some have suggested a direct connection between the presence of domestic cats and toxo-related infections in other animals, primarily land and marine mammals.

FORBES: House Cats Said to Lead to Car Crashes, Suicides, and Mental Disorders

It has just as much right to be on this land as all the other mammals.

NPR: Drilling to Begin in Colorado Ferret Habitat

If you go out from Earth up into space, you see our entire planet is a living organism - be it in the sea with all the fish, on the land with all the reptiles and mammals and insects, but the way man is behaving at the moment needs attention.

BBC: Norfolk - Chris Skinner's wildlife haven