The anklebones of hippos are adapted for running on land, and their shape is very similar to the fossilized anklebones found in whale ancestors like Ambulocetus and Rodhocetus. This evolutionary evidence suggests:
the fossils of ancient hippos should be found in the same stratigraphic layer as fossils of Ambulocetus and Rodhocetus
whales and hippos evolved from a common tetrapod ancestor with similar ankle bones
whales and hippos underwent convergent evolution
whales evolved from fish, and eventually gave rise to terrestrial mammals, including hippos
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The anklebones of hippos are adapted for running on land, and their shape is very similar...
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