The National Zoo's Small Mammal House has a new resident: Athena the two-toed sloth. The 1. 5-year-old shares her home with the zoo's golden lion tamarins, an aracari and Vlad, a 34-year-old male ...

The three-toed sloth emits a long, high-pitched call that echoes through the forests as “ahh-eeee.” Because of this cry these sloths are sometimes called ais (pronounced “eyes”).

Explore 15 wild animals that are rarely seen and often live in remote or protected habitats. These extraordinary species, including the Northern Hairy-Nosed Wombat, Pangolin, and Three-Toed Pygmy ...

Photo via Toucan Rescue Ranch. Today’s edition honors the Hoffman’s two-toed sloth, which, like a leap day, is often forgotten.Costa Rica is home to two sloth species: the brown-throated three-toed ...

WASHINGTON— The U.S. Fish and Wildlife Service today proposed protecting the pygmy three-toed sloth under the Endangered Species Act. The proposal responds to a 2013 petition filed after officials ...

They’re related to the extinct giant ground sloth. Two-toed and three-toed sloths both evolved from giant ground sloths, the largest of which weighed several tons and stood about 12 feet tall.

The distant relationship between the two modern sloth genera – species of two-toed sloth are grouped under Choloepus, and three-toed species under Bradypus – isn’t immediately obvious.

Three-toed sloths can grow between 17 and 31 inches in length, weigh between 5 and 14 pounds and up to 40 years. A lost three-toed sloth baby in Costa Rica was reunited with its mother after she ...