For years, scientists have debated whether humans or the climate have caused the population of large mammals to decline dramatically over the past several thousand years. A new study from Aarhus ...

North America used to be crawling with giant mammals, from dire wolves to big cats. Horses and camels evolved on the continent while others, like bison, crossed over from Asia. Most of these mammals ...

A 400,000-year-old giant sloth femur was discovered in Argentina, preserving rare muscle marks that reveal how these Ice Age ...

View post: Winter Storm Warnings Announced for 7 Inches of Snow as Winter Rebounds Paleontologists made a recent discovery that’ll shed light on what type of animals roamed the Earth millions of years ...

One of the most intriguing and intricate mysteries in paleontology is the disappearance of North America's giant mammals, or megafauna, which included saber-toothed cats, mastodons, and mammoths, some ...

Thaís Pansani examines the marks humans left on megafauna bones to determine when people arrived in South America and how they interacted with giant mammals Chihiro Kai 14,000 years ago, an early ...

Paleontologists have found fossilized remains of a giant possum-like mammal that lived 60 million years ago. The fossils, found at Big Bend National Park in Texas, belong to a group of ancient ...

Sloths weren't always slow-moving, furry tree-dwellers. Their prehistoric ancestors were huge — up to 4 tons (3.6 metric tons) — and when startled, they brandished immense claws.Video above: ...