Earth's earliest mammals spent their lives at a more leisurely pace than their modern counterparts, but they lived a lot longer, analysis of some 200-million-year-old teeth has shown. Earth's earliest ...

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 ...

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 ...

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. You can say this about mammals ...

The future is always hard to predict, especially millions of years from now. But researchers found that a future supercontinent centered around... You can say this about mammals: We've had a good run.