Hot-blooded or cold-blooded? Chemical clues solve one of paleontology’s oldest mysteries

Schematic drawing of a subset of animals studied in the research. Metabolic rates and resulting thermophysiological strategies are color coded, orange hues characterize high metabolic rates coinciding with warm blood, and blue hues characterize low metabolic rates coinciding with cold blood. From left to right: Plesiosaurus, Stegosaurus, Diplodocus, Allosaurus, Calypte (modern hummingbird). Credit: © J. …

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