Give that dino a hand.

Fossil handprints made by a crouching theropod (artist's depiction,) reveal that this meat-eating bipedal dinosaur had palms that always faced inward, suggesting theropods abandoned the use of their forelimbs as legs early in their evolution. The creatures include the tiny-armed Tyrannosaurus rex, which lived around 65 million years ago, and Allosaurus, which lived about 150 million years ago and was also poorly endowed in the biceps department. There are very few scenarios in which those forelimbs could have touched the ground, Andrew R.C. Milner of the St. George Dinosaur Discovery Site in Utah and his colleagues report online March 3 in PLoS ONE.

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