Estemmenosuchus mirabilis waterside

by: Walter B. Myers/Novapix
Reference: t-din00-30102
Date: 2010-04-18

Resembling modern day hippopotami, three Estemmenosuchus mirabilis face off in a Paleozoic lake 255 million years ago in what is today the Perm region of Russia near the Ural Mountains. About the size of a modern adult bull, Estemmenosuchus mirabilis was a plant-eating early ancestor of today's mammals.

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