La Brea Tar Pits scientists have successfully identified a previously unknown species to Southern California through ...

Lying on the pebbles and rocks of the riverbed at low tide was a human femur, or upper leg bone, which told a story far older than anyone had expected. Video by Sarah Lee Timothée Chalamet on how ...

Sloths weren’t always slow-moving, furry tree-dwellers. Their prehistoric ancestors were huge — up to 4 tons (3.6 metric tons ...