Contact: Lee J. Siegel
University of Utah
Caption: A monitor lizard hugs a branch. A new University of Utah study found that air flows mostly in a one-way loop through the lungs of savannah monitor lizards, just as it does in birds, alligators and presumably dinosaurs. The discovery means this unusual one-way airflow may have evolved 270 million years ago -- 100 million years before birds first flew.
Credit: © Cheryl A. Ertelt.
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