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Meet the Earliest Creature to Walk on All Fours

Walking on all fours was a major evolutionary development, and now scientists believe it happened at least 260 million years ago, far earlier than previously thought. The analysis comes after researchers at Brown University looked at the fossilized bones of a pre-reptile called Bunostegos akokanensis. Bunostegos, an herbivore who roamed the supercontinent called Pangea, was unlike other known, similar creatures of the time that researchers say likely walked like modern-day...

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