Nick Gordon / Pale throated sloth (Bradypus tridactylus) climbing Cercropia tree to feed on fruit, forest gap specialist, Amazonia, Brazil

Nick Gordon / Pale throated sloth (Bradypus tridactylus) climbing Cercropia tree, forest gap specialist, Amazonia, Brazil

Nick Gordon / Pale throated three toed sloth (Bradypys tridactylus) climbing (Cercropia) tree, forest gap specialist, Amazonia, Brazil

Staffan Widstrand / Pale throated sloth {Bradypus tridactylus} carrying young, Brazil.

Staffan Widstrand / Pale throated sloth {Bradypus tridactylus} Manaus, Brazil, South America

Staffan Widstrand / Pale throated sloth climbing carrying young {Bradypus tridactylus} Brazil

Staffan Widstrand / Pale throated sloth climbing tree {Bradypus tridactylus} Manaus, Brazil.

Gerry Ellis / Pale-throated Three-toed Sloth (Bradypus tridactylus) sleeping in tree, Amazon ecosystem, Brazil

Gerry Ellis / Pale-throated Three-toed Sloth (Bradypus tridactylus) portrait, Brazil

Gerry Ellis / Pale-throated Three-toed Sloth (Bradypus tridactylus), Amazon Basin, Brazil

Paul D Stewart / Three toed sloth (Bradypus tridactylus). Skeleton of a three toed sloth, or 'Ai', copperplate engraving from Cuvier's 'Ossamens Fossiles' 1812. Cuvier saw that the key to understanding fossils was to...

Piotr Naskrecki / Pale-throated Three-toed Sloth (Bradypus tridactylus) is inspected by entomologist Christopher Marshall and his assistants for symbiotic moths, Kamoa River, Guyana