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Triassic Crocodile Relative May Have Learned to Walk on Two Legs

Fossils from the Chinle Formation of Petrified Forest National Park in Arizona, the United States, reveal that Sonselasuchus cedrus, a species of shuvosaurid that lived about 215 million years ago (Triassic period), likely began life walking on four legs before shifting to a bipedal stance as it matured.

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