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Dinosaur handprints reveal birdlike arm anatomy

Inward-facing palms evolved much earlier than previously recognized

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7:52pm, March 3, 2009

Fossil handprints made by a crouching theropod reveal that those meat-eating bipedal dinosaurs had palms that always faced inward, a sign that these creatures abandoned the use of their forelimbs as legs early in their evolution.

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