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WEKU
Becky Sullivan

250 million is the new 40: Mammals may already be halfway done on Earth, study finds

A new study in the journal Nature Geoscience predicts that 250 million years from now, a supercontinent formed around the equator will be too hot for mammals to survive. (Jean-Philippe Ksiazek/AFP via Getty Images)

You can say this about mammals: We've had a good run.

Over the 250 million years since the first mammals diverged from reptiles and birds, we hairy, warm-blooded vertebrates have come to dominate the Earth, with rodents and humans and ungulates and whales living on nearly every inch of the planet.

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