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Medical imaging shows dinosaur heart more like bird's or mammal's than reptile's

in the dinosaurean to bird lineage and in ornithiscians, the researchers say.

What the heart structure can reveal about dinosaurs' activity levels and the cold- v. warm-blooded debate is a question that "begs for more work," Russell said.

To that end, the authors urge in their paper that fossil hunters make a point of looking for traces of soft tissue in their discoveries. In the past, much of this evidence was probably overlooked by researchers seeking only bones.

"In order to clean a specimen up to display as a skeleton, you'd throw everything away that wasn't bone. It makes you wonder how much stuff we've missed," said co-author Paul Fisher.


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Contact: Heather Singmaster
hsingmas@aaas.org
202-326-6414
American Association for the Advancement of Science
20-Apr-2000


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