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Wild at heart

发布时间:2019-03-07 05:13:10来源:未知点击:

By Jeff Hecht PALAEONTOLOGISTS have found what appears to be a fossilised dinosaur heart in the chest cavity of a 300-kilogram plant-eating beast that died 66 million years ago. The discovery may help resolve a long-running debate over dinosaurs’ metabolism. Early researchers thought dinosaurs were relatively inactive “cold-blooded” creatures, like modern reptiles and crocodiles. But many palaeontologists now believe dinosaurs generated their own body heat, allowing them to lead more active lives. The fossilised heart resembles that of modern birds and mammals, suggesting the dinosaur was “a pretty active fellow”,