Footprints in China show dinosaurs came in from the cold to rule the world, say scientists

A primitively feathered theropod dinosaur carries off a mammalian victim during a snowy volcanic winter caused by massive eruptions during the Triassic-Jurassic Extinction.Dinosaurs survived the freezing winters that wiped out big reptiles about 200 million years ago thanks to feathers, and they went on to thrive afterwards, according to a study based on a recent desert excavation in Xinjiang in western China.

For example, the long-necked basal sauropodomorphs spread to the tropics from mid-and higher latitudes, definitive ornithischian "bird-hipped" dinosaurs appeared for the first time, and "the maximum size of theropods increased by 20 per cent, equating to nearly a doubling of mass", they said. "Through their adaptation to cold temperatures, dinosaurs were able to survive … volcanic winters and thereby expand to dominate terrestrial communities for the next 135 [million years], and, like birds, remain two to three times more speciose than mammals to this day."

"The key to their eventual dominance was very simple. They were fundamentally cold-adapted animals. When it got cold everywhere, they were ready, and other animals weren't," he said.

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