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Bob Strauss

500 Million Years of Vertebrate Evolution

By December 31, 2012

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Vertebrate animals have come a long way since their tiny, translucent ancestors swam the world's seas over 500 million years ago. Here's a roughly chronological list of the major vertebrate animal groups, ranging from fish and amphibians to dinosaurs and mammals.

Illustration of Cacops: Dmitri Bogdanov

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