Claudio Contreras / Central American spider monkey (Ateles geoffroyi) juveniles hanging by tails and playing, Calakmul Biosphere Reserve, Yucatan Peninsula, Mexico, August

Edwin Giesbers / Brown headed spider monkey (Ateles fusciceps) mother and baby, captive occurs in Central and South America.

Edwin Giesbers / Brown headed spider monkey (Ateles fusciceps) group resting together, captive occurs in Central and South America.

Thomas Marent / Black-faced Spider Monkey (Ateles chamek) juvenile calling, Tambopata-Candamo Nature Reserve, Peru

Mark Bowler / Black spider monkey (Ateles chamek) calling, captive, Peru.

Cyril Ruoso / Man with Chamec spider monkeys (Ateles chamek) holding onto him as he walks through sanctuary. Ikamaperou Sanctuary, Amazon, Peru. October 2006.

Suzi Eszterhas / Black-handed spider monkey (Ateles geoffroyi), Osa Peninsula, Costa Rica.

Ammonite / Black-handed / Geoffroy's spider monkey (Ateles geoffroyi) feeding on figs, Santa Rosa National Park, Costa Rica.

Claudio Contreras / Central American Spider Monkey (Ateles geoffroyi) in tree, Punta Laguna, Otoch Ma'ax Yetel Kooh Reserve, Yucatan Peninsula, Mexico, October. Endangered species.

Claudio Contreras / Central American Spider Monkey (Ateles geoffroyi) orphan baby hanging from washing line. El Mirador- Rio Azul National Park, Department of Peten, Guatemala.

Claudio Contreras / Central American Spider Monkey (Ateles geoffroyi) juvenile, Punta Laguna, Otoch Ma'ax Yetel Kooh Reserve, Yucatan Peninsula, Mexico, October. Endangered species.

Eric Baccega / Brown headed spider monkey (Ateles fusciceps) mother with baby, captive