Not too hot and not too cold: Mesothermy in dinosaurs

June 15, 2014 3:28 PM

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Paleontologists have often debated whether dinosaurs were warm-blooded (endotherms) like birds and mammals or cold-blooded reptiles (ectotherms) like reptiles and amphibians.

Endotherms are animals that maintain a constant body temperature even when environmental temperatures fluctuate. In contrast, the environment regulates the body temperature of ectotherms and thus their metabolic rate tends to be lower than the metabolic rates of endotherms, which must maintain a hig...

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