![]() ![]() ![]() Knowing whether dinosaurs were warm- or cold-blooded could give us clues about how active they were and what their everyday lives were like, but previous methods to determine their warm- or cold-bloodedness - how quickly their metabolisms could turn oxygen into energy - were inconclusive. ![]() Paleontologists have been debating for decades whether dinosaurs were warm-blooded, like modern mammals and birds, or cold-blooded, like modern reptiles. From left to right: Plesiosaurus, Stegosaurus, Diplodocus, Allosaurus, Calypte (modern hummingbird). Metabolic rates and resulting thermophysiological strategies are color-coded, orange hues characterize high metabolic rates coinciding with warm-bloodedness, and blue hues characterize low-metabolic rates coinciding with cold-bloodedness. Schematic drawing of a subset of the animals that were investigated as part of the research. ![]()
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