Joshua Rapp Learn

The sauropod dinosaur Nigersaurus likely evolved its strangely-shaped head to better mow prehistoric lawns. Newsletter

Ritual circles — like the ancient stone plaza found in Peru's Cajamarca Valley — date back as far as 5,000 years ago.

For centuries, researchers and explorers have been seeking the beginnings of one of the world’s mightiest rivers - the Amazon river.

Scientists have unveiled a complete fossil of a bizarre, long-necked aquatic reptile that resembles a snake or dragon — and other specimens can illuminate how the ancient animal lived.

From the largest turtle ever discovered to the sea turtle that used its elongated snout to suck up food, tortoises today can't compare to these titanic reptiles.

Humans have left evidence of their passing through America’s great rift for more than 10 millennia.

Did Neanderthals wear clothing, jewelry or other accessories? There's not much in the archaeological record to suggest so, but researchers are turning to indirect evidence for clues about ancient fashion styles.

Researchers suggests this bumblebee strategy may be an important way to limit infection in bee nests. Newsletter

Why did the Aztecs sacrifice humans to the gods? Learn more about what this ritual served, along with other purposes.