Lucas Bustamante / White-bellied spider monkey (Ateles belzebuth) Yasuni National Park, Orellana, Ecuador.

Cyril Ruoso / White-bellied spider monkey (Ateles belzebuth) holding branch with prehensile tail, Pacaya Samiria NP, Amazon, Peru

Pete Oxford / White-bellied spider monkey (Ateles belzebuth) climbing from tree to tree, Yasuni National Park, Amazon Rainforest, Ecuador. South America.

Tim Laman / Spider Monkey (Ateles belzebuth) at the Tiputini Biodiversity Station, Orellana Province, Ecuador, July.

Tim Laman / Spider Monkey (Ateles belzebuth) in tree above the clay lick at the Tiputini Biodiversity Station, Orellana Province, Ecuador, July.

Joel Sartore / Photo Ark / White-bellied spider monkey (Ateles belzebuth) with arm raised, portrait, Quistococha Zoo, Peru. Captive. Endangered.