Thaís Pansani examines the marks humans left on megafauna bones to determine when people arrived in South America and how ...

Natural Trap Cave near Lovell is one of the best Ice Age fossil sites in the world, but its lack of saber-toothed cats and giant ground sloths ...

Sloths live in perpetual slow motion in the tropical rainforests of Central and South America today. But Roughly 10,000 years ago, a family of ancient, giant relatives would roam any number of ...

The fossilized leg bone of the terror bird went unidentified for almost 20 years. Nearly 12 million years ago, the largest ...

From fearsome land mammals to deadly sea creatures, we rank the most terrifying animals that once roamed Earth.

Nearly 12,600 years ago, during the Late Pleistocene era, a group of humans hunted and killed a giant ground sloth in Argentina, then left the animal's bones behind, along with their butchering knife.

While past terror bird fossils placed the meat-eating birds at 3 to 9 feet tall, new findings suggest that some were even ...

The extinct giant ground sloths were some of the only mammals that had digestive systems large enough to process the huge avocado seeds whole. They feasted on the fruit and then dispersed the ...

Nearly 27,000 years ago, a giant ground sloth traveled across a barren, arid landscape in what is now Belize, munching on grassy vegetation and searching for water. A nearby sinkhole may have ...

Unlike now, most extinct sloths lived on the ground and some were many times larger than modern tree sloths. Mylodon darwinii is the scientific name for a species of extinct giant ground sloth. On ...

Researchers including a Johns Hopkins University evolutionary biologist report they have analyzed a fossil of an extinct ...