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

Daniel Heuclin / Unau / two-toed sloth (Choloepus didactylus) portrait, French Guiana

Roland Seitre / Hoffman's Two Toed Sloth (Choloepus hoffmanni) being weighed and recorded. Aviarios del Caribe Sloth Refuge, Costa Rica, 2008.

Roland Seitre / Volunteer holding Hoffman's Two Toed Sloth (Choloepus hoffmanni) Aviarios del Caribe Sloth Refuge, Costa Rica, 2008.

Roland Seitre / Hoffmann's Two Toed Sloth (Choloepus hoffmanni) baby wrapped in cloth. Aviarios del Caribe Sloth Refuge, Costa Rica, 2008.

Roland Seitre / Brown-throated Three Toed Sloth (Bradypus variegatus) and Hoffmann's Two Toed Sloths (Choloepus hoffmanni) babies being fed. Aviarios del Caribe Sloth Refuge, Costa Rica, 2008.

Roland Seitre / Brown-throated Three Toed Sloth (Bradypus variegatus) and Hoffmann's Two Toed Sloths (Choloepus hoffmanni) babies held by orphanage owner, Judy Avey-Arroyo. Aviarios del Caribe Sloth Refuge, Costa Ric...

Luiz Claudio Marigo / People taking photographs of a Brown-throated Three-toed Sloth (Bradypus variegatus) in Parque Centenario, downtown Cartagena de Indias city, Magdalena Department, Colombia, February 2011.

Michael Pitts / Looking up at Three toed / Pale throated sloth {Bradypus tridactylus} swimming across mangrove channel, South America

Staffan Widstrand / Brownthroated / Three-toed sloth carrying young {Bradypus variegatus} Brazil.

Anup Shah / Close up of Hoffmann's two toed sloth limbs and claws {Choloepus hoffmanni} species native to South America

Pete Oxford / Brown throated three toed sloth {Bradypus variegatus} climbing tree. Amazon, Brazil