Circulatory system comparison
Recently it has been proposed that some dinosaurs may have been warm-blooded like birds. Evidence supporting this comes from the discovery of Willo, a Thescelosaurus fossil found with a well-preserved heart. The heart had four chambers and only one aorta, this formation is usually indicative of a warm-blooded animal, not a cold-blooded one such as a reptile. Many lines of evidence suggest that the giant sauropods were probably warm-blooded and metabolically active when young, but slowed their metabolism as they approached maturity, this decreased the load on the circulatory system.
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