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Of hippopotami and whales
Email: David Bruce - david.bruce@biomedcentral.com News from The Scientist 2001, 2(1):20010921-04
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All the mammals that existed in the early Tertiary period (65-50 million years ago) lived on land. Therefore the aquatic cetaceans (toothed and baleen whales) that began to appear 50 million years ago in the Eocene must have evolved from terrestrial animals. What remains unclear is which group of terrestrial animals returned to the water and exactly how this transition was achieved.
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