Pigs, rats, cats and mongooses, all brought to the island decades earlier by humans, were to blame for their demise, preying ...

The earliest known North Americans used wooden "vehicles" to transport goods, and possibly even people, more than 20,000 years ago, a new study suggests. Researchers discovered sled-like drag marks ...

Huge tunnels under southern Brazil and northern Argentina were potentially made by giant, Ice Age sloths for refuge and rest ...

Sloths weren’t always sleepy tree-dwellers. In the Ice Age, they grew to the size of elephants and defended themselves with ...

As the world's largest bear, and largest land carnivore, polar bears are impressive mammals and are adapted to living in the ...