Photo: New Birdlike Dinosaur Found in Argentina

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The newfound Aerosteon riocoloradensis had both lungs (in red) and air sacs (in other colors), much like modern-day birds.

The 33-foot (10-meter) long dinosaur—described in a September 2008 study—has given scientists new insight into the evolution of bird lungs.

Illustration by Todd Marshall, copyright 2008 National Geographic Society

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