Image Gallery: 25 Primates in Peril

Ecuadorian brown-headed spider monkey

Ecuadorian brown-headed spider monkey (Ateles fusciceps fusciceps), Ecuador

Ka-apor capuchin monkey

Ka’apor capuchin monkey (Cebus kaapori), Brazil, Added for the first time to The World's 25 Most Endangered Primates list in 2012.

San Martin titi monkey

San Martín titi monkey (Callicebus oenanthe), Peru. Added for the first time to The World's 25 Most Endangered Primates list in 2012.

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Northern brown howler monkey

Northern brown howler monkey (Alouatta guariba guariba), Brazil. Added for the first time to The World's 25 Most Endangered Primates list in 2012.