Over 30 million years ago, monkeys crossed the Atlantic on rafts. Researchers believe they made the 1,000-mile journey on small islands that tore away from the coastline during violent storms and ...

Early human migration timeline into South America has stirred debate. Researchers have long argued about when these first ...

This is a reconstruction of the prehistoric mammal Spinolestes in the Cretaceous-period Las Hoyas wetland. This image is not associated with the current study but demonstrates a dark-furred mammal ...

What comes to mind when you think of the prehistoric world ... resemble larger versions of their living relatives. The rise of mammals The earliest known mammals first appeared about 225 to ...