Fossil tracks from 545 million years ago suggest complex life forms were already crawling around before the Cambrian ...

A newly documented fossil site in Morocco’s Western Anti-Atlas reveals rare evidence of the Ediacaran-Cambrian transition, a ...

At least five times, a catastrophe has killed off the vast majority of Earth’s species. As scientists say we’re in a sixth mass extinction, what can we learn from the past?

Extinction and speciation are important processes in evolution. But what we know right now is that the rate of extinction today is somewhere on the order of 1,000 to 10,000 times faster than the ...

Editor's Note: This story was updated on Friday, Dec. 22 at 4:15 p.m. E.D.T. to correct the timing of the first mass extinction. It occurred 20 million, not 20, years after the Cambrian explosion.