Evolution. Competition. Mass extinction. Three fundamental rules have driven the rise and fall of life on Earth for o...

For billions of years, land on Earth was uninhabitable. But in the seas, predation allowed species to thrive before —...

Sprawling moss, towering trees, flying insects, limbed amphibians: Early species vied for domination as the land went...

After Earth's third mass extinction, mammals' surviving ancestors ruled the supercontinent Pangea. But lizards soon u...

The formation of continents with varied environments allowed for an explosion of biodiversity — and turbo-charged the...

The dinosaurs met their end with a cataclysmic asteroid impact. Rising from the ashes, birds reinvented themselves in...

Emerging from the dinosaurs' shadows, mammals went from underdogs to global power, with game-changing adaptations tha...

As the Ice Age thawed, humans rose above the rest. But the possibility of a sixth mass extinction now looms: Has our ...