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Science 21 April 2000:
Vol. 288. no. 5465, pp. 416 - 417
DOI: 10.1126/science.288.5465.416b
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News of the Week

PALEONTOLOGY:
Revealing a Dinosaur's Heart of Stone

Virginia Morell

On page 503, researchers report discovering the first known dinosaur heart inside the nearly complete skeleton of Thescelosaurus, a small, plant-eating dinosaur. The heart's anatomy is more like that of birds and mammals than crocodiles or other reptiles, the team says. And a heart that beats like a bird's suggests that this dinosaur's metabolic rate would have been more like that of a warm-blooded animal than a cold-blooded one, providing yet another feature shared by dinosaurs and their putative feathered relatives, the team asserts.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)