During his travels in Uruguay, Darwin uncovered fossils belonging to Glossotherium, also known as the “tongue beast,” another species of giant sloth ... s National Museum of Natural History.

Suzi Eszterhas (USA) captures an encounter between a sloth and a dog. The brown-throated sloth had already made it across a road, but to reach the next clump of trees it needed to return to the ground ...

The Smithsonian National Museum of Natural History's exhibits and facilities (including restrooms, several gift shops and two cafes) are free to visit, but fees do apply for the Butterfly Pavilion ...