You've gotta have heart.(LETTERS)(Letter to the Editor)

Publication: Natural History

Publication Date: 01-OCT-05

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COPYRIGHT 2005 Natural History Magazine, Inc.

All endothermic vertebrates (mammals and birds) have four-chambered hearts, to satisfy the high oxygen demand imposed by maintaining a high body temperature. After reading the responses by John A. Ruben, Willem J. Hillenius, and Mary Higby Schweitzer to the question, "Were Dinosaurs 'Cold-' or 'Warmblooded'" [5/05], I wondered, is...

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