Rise of the dinosaurs traced back to their adaptation to cold

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Covering of feathers left them able to cope when other creatures died off in mass extinction event, scientists say

Fossil hunters have traced the rise of the dinosaurs back to the freezing winters the beasts endured while roaming around the far north.

“The key to their eventual dominance was very simple,” said Paul Olsen, the lead author on the study at the Lamont-Doherty Earth Observatory at Columbia University. “They were fundamentally cold-adapted animals. When it got cold everywhere, they were ready, and other animals weren’t.” But the scientists also found small pebbles in the normally fine sediments of the basin, which once held several shallow lakes. The pebbles were identified as “ice-rafted debris”, meaning they were carried away from the lakesides on sheets of ice before falling to the bottom when the ice melted.

 

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