250 million is the new 40: Mammals may already be halfway done on Earth, study finds
The future is always hard to predict, especially millions of years from now. But researchers found that a future supercontinent centered around the tropics may be tough for mammals to survive.
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.
But the end to that reign may come much sooner than traditionally thought, published this week in the journal .
