The fossil discovered at Sea-Tac Airport is at the Burke Museum, and named for the man who first came across it. Nearly 60% ...

For a long time, scientists believed the first humans to arrive in the Americas soon killed off these giant ground sloths through hunting, along with many other massive animals like mastodons ...

From a passageway made by giant sloths to a slinky tunnel bridge and an 'entrance to hell' - there are some extraordinary tunnels across the globe, including one beneath 10 Downing Street ...

Sloths were not always slow-moving, furry tree-dwellers. Their prehistoric ancestors were huge — up to four tonnes — and when startled, they brandished immense claws. For a long time, scientists ...

For a long time, scientists believed the first humans to arrive in the Americas soon killed off these giant ground sloths through hunting, along with many other massive animals such as mastodons ...

Thaís Pansani holds a giant sloth rib bone from central Brazil dated to about 13,000 to 15,000 years ago, which is thought to be burned by human-made fire, in the Smithsonian's National Taphonomy ...

This illustration provided by researchers depicts a person carving an osteoderm from a giant sloth in Brazil about 25,000 to 27,000 years ago. (Júlia d'Oliveira via AP) SAO PAULO, Brazil (AP) — Sloths ...

An illustration depicting a person carving an osteoderm from a giant sloth in Brazil about 25,000 to 27,000 years ago (Julia d’Oliveira via AP) Sloths were not always slow-moving, furry tree ...

This illustration provided by researchers depicts a person carving an osteoderm from a giant sloth in Brazil about 25,000 to 27,000 years ago. (Júlia d'Oliveira via AP) SAO PAULO (AP ...