Pete Oxford / Brown throated sloth with young hanging from branch. {Bradypus variegatus} Brazil, South America

Staffan Widstrand / Brownthroated / Three-toed sloth carrying young up tree {Bradypus variegatus} Rio Negro, Brazil, South America

Bernard Castelein / Brown-throated sloth ( Bradypus variegatus), between Rurrenabaque and Sancta Rosa, Bolivia

Lucas Bustamante / Brown throated three toed sloth (Bradypus variegatus) hanging from branch, Yasuni National Park, Orellana, Ecuador.

Lucas Bustamante / Hoffmann's two-toed sloth (Choloepus hoffmanni) swimming, Tambopata, Madre de Dios, Peru.

Lucas Bustamante / Hoffmann's two-toed sloth (Choloepus hoffmanni) hanging from branch at night, Tambopata, Madre de Dios, Peru.

Lucas Bustamante / Juvenile of Three-Toed Sloth (Bradypus variegatus) hanging on a tree. Yasuni National Park, Orellana, Ecuador.

Ingo Arndt / Brown-throated three-toed sloth (Bradypus variegatus) on branch above river in rainforest, Peru

Ingo Arndt / Brown-throated three-toed sloth (Bradypus variegatus) hanging from branch above river in rainforest, Peru

Ingo Arndt / Close up of foot of Hoffmann's two toed sloth {Choloepus hoffmanni}

David Tipling / Brown-throated Sloth (Bradypus variegatus) female, seen from canopy tower, Soberiana NP, Panama.

David Tipling / Brown-throated Sloth (Bradypus variegatus) female, seen from canopy tower, Soberiana NP, Panama.