PHOTOS: Meat-Eating Dino had Birdlike Breathing System

PHOTOS: Meat-Eating Dino had Birdlike Breathing System
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Aerosteon had both lungs (in red) and air sacs (in other colors). The dinosaur was 33 feet (10 meters) long and had stiff, birdlike legs.

The find "leaves little discussion that air sacs existed and that meateaters really do have lung structures that resemble birds'," said Sereno, a paleontologist at the University of Chicago.

His research team found that the wishbone, hipbone, and stomach ribs were hollow, a tell-tale sign of air sacs.
—Illustration by Todd Marshall, copyright 2008 National Geographic Society
 
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