Cardiovascular Evidence for an Intermediate or Higher Metabolic Rate in an Ornithischian Dinosaur

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Science  21 Apr 2000:
Vol. 288, Issue 5465, pp. 503-505
DOI: 10.1126/science.288.5465.503

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Computerized tomography scans of a ferruginous concretion within the chest region of an ornithischian dinosaur reveal structures that are suggestive of a four-chambered heart and a single systemic aorta. The apparently derived condition of the cardiovascular system in turn suggests the existence of intermediate-to-high metabolic rates among dinosaurs.

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