Dinosaur handprints reveal birdlike arm anatomy | Science News



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Dinosaur handprints reveal birdlike arm anatomy

Inward-facing palms evolved much earlier than previously recognized

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.

Theropods include the tiny-armed Tyrannosaurus rex, which lived between 68 million and 65 million years ago, and Allosaurus, which lived about 150 million years ago and was also poorly endowed in the bicep department. Because most theropods’ arms were very small, there are very few scenarios where those forelimbs could have touched th

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