Hot or cold dinos

Patterns in dinosaur bones fuel a debate over whether they were warm- or cold-blooded

By Stephen Ornes, 11:00 AM July 12, 2012

Dinosaurs have been dead for about 65 million years, which makes studying the animals — not just their unearthed bones and teeth — extraordinarily difficult. But that hasn’t kept researchers from trying. Newfound evidence may now help answer one question that still vexes scientists: Were the ancient reptiles warm- or cold-blooded?

Bodies of warm-blooded animals, such as mammals and birds, stay the same temperature no matter what the weather is. The body temperature of cold-blooded animals...

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