International Sloth Day Timeline

​1804

Presidential sloth

Thomas Jefferson was involved in the discovery of an extinct sloth species. He received a gift fossil from a friend and submitted a research paper.

​1941

Prehistoric proof

​Smithsonian curator Remington Kellogg found a substance at the Grand Canyon that turned out to be 100,000-year-old sloth fecal matter. This sample has since allowed researchers to learn about past diet, and give insight into the environment in which they lived.

​1995

​Sloth fossils discovered

​Researchers found sloth fossils off a coastal desert in Peru and discovered they belonged to a group of sloths called Thalassocnus, who were semiaquatic and lived alongside whales and crocodiles.

2019

Senior sloth

The oldest known sloth alive turned 50 at a German zoo. The two-toed sloth, named Paula, first arrived in 1971. Oddly enough, zoo staff thought that Paula was male for over 20 years. They only discovered she was female in 1995 following an ultrasound.