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Big dinosaurs kept their cool

Body temperature of long-gone beasts resembled that of mammals

How do you take a dinosaur’s temperature? Very carefully.

By counting chemical bonds in 150-million-year-old fossilized teeth, scientists have done the paleontological equivalent of jamming a thermometer up a giant reptile’s rear end. Reporting online June 23 in Science, the researchers say the huge, four-legged dinosaurs known as sauropods would have registered a body temperature similar to that of any modern Homo sapiens.

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