The climate of the Sahara was completely different thousands of years ago.

About 59 million years ago, the largest animal lurking in the ancient forests of Colombia by far was Titanoboa - the largest snake ever known.

The Carboniferous Rainforest Collapse set the stage for a takeover that would be a crucial turning point in the history of terrestrial animal life.

Long necks gave sauropods a huge advantage when it came to food, but not in the way you think.

Throughout the Cenozoic Era -- the era we’re in now -- marsupials and their metatherian relatives flourished all over South America, filling all kinds of ecological niches and radiating into forms that still thrive on other continents.

From end to end, its forelimbs alone measured an incredible 2.4 meters long and were tipped with big, comma-shaped claws.

Throughout the first half of the 20th century, Neandertals were thought to have been…primitive. Unintelligent, hunched-over cavemen, for lack of a better word. But the discoveries made in that Iraqi cave provided some of the earliest clues that Neanderthals actually behaved -- and likely thought and felt -- a lot like we do.

How could a body of water as big as the Mediterranean just...disappear?

How does a bear -- which is a member of the order Carnivora -- evolve into an herbivore?

Because of their strange combination of bear-like and dog-like traits, they’re sometimes confusingly called the beardogs. And even though you’ve never met one of these animals, the beardogs are key to understanding the history of an important branch of the mammal family tree.