Swinging down from a tree in the lush forest that stood in what is now the Fayum desert region in Egypt, the little creature reached the riverbank and began to drink. Suddenly it was attacked and eaten by a crocodile-like reptile that rose without warning from the water. All that the predator left behind was the victim's head, which sank to the bottom and became embedded in the sand. In New Haven, Conn., last week, some 28 million years after this hypothetical drama, Yale Paleontologist Elwyn Simons displayed the ancient skull and...
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