World's greatest mass extinction triggered switch to warm-bloodedness (IMAGE)

University of Bristol

World's greatest mass extinction triggered switch to warm-bloodedness

Caption

Posture shift at the end of the Permian, 252 million years ago. Before the crisis, most reptiles had sprawling posture; afterwards they walked upright. This may have been the first sign of a new pace of life in the Triassic.

Credit

Credit: animal drawings by Jim Robins, University of Bristol.

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