Most dinosaurs were giants, study finds

12/20/2012 | LiveScience.com

A study comparing the size ranges among prehistoric and present-day animal species has found that dinosaurs were heavily skewed toward the giant end of the spectrum -- a finding that goes against the assumption that dinosaurs also ranged in size from small to large. Queen Mary University paleontologist David Hone, who contributed to the study of more than 330 dinosaur species, said massive size was a bonus for the ancient reptiles. "As you get bigger, you get more energetically efficient, as being big gives you a longer digestion time and returns more energy from eaten food," Hone said. "But mammals can't get that huge or they would overheat."

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