Alligators at the University of Utah (IMAGE)

University of Utah

Alligators at the University of Utah

Caption

Small alligators at the University of Utah. A new study shows air moves in one direction once it enters an alligator's lungs -- a discovery that may explain why the ancestors of dinosaurs and birds came to rule the Earth after a mass extinction killed many mammal-like reptiles 251 million years ago.

Credit

Hannah J. Chirillo.

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