JOSE ANTONIO PENAS / SCIENCE PHOTO LIBRARY JOSE ANTONIO PENAS / SCIENCE PHOTO LIBRARY
Castorocauda prehistoric aquatic mammal, illustration. This extinct mammal dates from the Jurassic, around 164 million years ago. Its fossils were first discovered in 2004, in Inner Mongolia in China. It is an example of convergent evolution, similar to modern beavers and otters.
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