Kevin Schafer / Golden lion tamarin (Leontopithecus rosalia) wild, Poco das Antas Reserve, Atlantic Forest, Southeast Brazil, Critically endangered, November. Did you know? More than 400 Golden lion tamarins have bee...

Lisa Hoffner / Wild Cotton-top tamarin (Saguinus oedipus) appears to fly through the air as it jumps from branch to branch in the dry tropical forest of Colombia, South America. IUCN List: Critically Endangered

Lisa Hoffner / Wild Cotton-top Tamarin (Saguinus Oedipus) on vine, in tropical dry forest of Colombia, South America. IUCN List: Critically Endangered

Lisa Hoffner / Wild Cotton-top tamarins (Saguinus oedipus) climbing up fallen branches in dry tropical forest of Colombia, South America. IUCN List: Critically Endangered

Lisa Hoffner / Wild Cotton-top tamarin (Saguinus oedipus) hanging from hind legs (never before observed behaviour) in the dry tropical forest of Colombia, South America. IUCN List: Critically Endangered

Lisa Hoffner / Portrait of two wild Cotton-top Tamarins (Saguinus Oedipus) resting on vine in tropical dry forest of Colombia, South America. IUCN List: Critically Endangered

Lisa Hoffner / Portrait of wild Cotton-top tamarins (Saguinus oedipus) standing on a branch in dry tropical forest of Colombia, South America IUCN List: Critically Endangered

Rod Williams / Cotton-top tamarin {Saguinus oedipus} portrait. Captive, from Colombia.

LYNN M. STONE / Emperor tamarin {Saguinus imperator} captive

JIM CLARE / Emperor tamarin, Amazon rainforest

Pete Oxford / Saddleback tamarin {Saguinus fuscicollis} feeding on Combretum assimile tree flowers/fruit, Madre de Dios rainforest, Peru, South America

Anup Shah / White lipped tamarin {Saguineus labiatus} native to South America