Lisa Hoffner / From inside of hide / blind looking out. Blue lines lead to a trap used to capture Cotton top tamarins for veternarian inspection. Colombia, South America. February 2008

Lisa Hoffner / Field assistant Felix Medina waits in a hide / blind for a Cotton-top tamarin to appear. Dry tropical forest, Colomibia, South America. February 2008

Lisa Hoffner / Biologist Luis Soto inspects fruit from the Patica de Paloma (Stylogyne turbacensis) tree. Endemic to Colombia and eaten by Cotton-top tamarins (Saguinus oedipus) Colombia, South America. February 20...

Lisa Hoffner / Group of four Cotton-top tamarin (Saguinus oedipus) climbing tree in dry tropical forest of Colombia, South America IUCN List: Critically Endangered

Lisa Hoffner / Portrait of a Cotton-top tamarin (Saguinus oedipus) climbing a vine in the dry tropical forest of Colombia, South America IUCN List: Critically Endangered

Lisa Hoffner / Anesthetized wild Cotton-top tamarin (Saguinus Oedipus) newly painted by the research team. A system used to track different tamarin study groups. Colombia, South America. February 2008 IUCN List: Cr...

Lisa Hoffner / Close up of Cotton-top tamarin hand (Saguinus oedipus). Colombia, South America. February 2008 IUCN List: Critically Endangered

Lisa Hoffner / Veternarian Dave Wehdeking, performing health exam on wild Cotton-top tamarin (Saguinus oedipus). Colombia, South America. February 2008 IUCN List: Critically Endangered

Lisa Hoffner / Veternarian Dave Wehdeking, performing health examination on wild Cotton-top tamarin (Saguinus oedipus) Colombia, South America. February 2008 IUCN List: Critically Endangered

Lisa Hoffner / Adult carrying four week old baby Cotton-top tamarin (Saguinus Oedipus) in dry tropical forest of Colombia, South America. IUCN List: Critically Endangered

Lisa Hoffner / Wild Cotton-top tamarin (Saguinus oedipus) walking on a vine in the dry tropical forest of Colombia, South America IUCN List: Critically Endangered

Lisa Hoffner / Wild Cotton-top tamarin (Saguinus oedipus) leaping (never before photographed behaviour) on branches in the dry tropical forest of Colombia. IUCN List: Critically Endangered

Suzi Eszterhas / Cotton-top Tamarin (Saguinus oedipus) conservationist with titi poles, which are fence poles made out of littered plastic bottles, Proyecto Titi, Colombia

Suzi Eszterhas / Cotton-top Tamarin (Saguinus oedipus) conservation, titi pole, which are fence poles made out of littered plastic bottles, Proyecto Titi, Colombia

Suzi Eszterhas / Cotton-top Tamarin (Saguinus oedipus) conservationist making titi poles, which are fence poles made out of littered plastic bottles, Proyecto Titi, Colombia

Suzi Eszterhas / Cotton-top Tamarin (Saguinus oedipus) conservationist making titi poles, which are fence poles made out of littered plastic bottles, Proyecto Titi, Colombia

Suzi Eszterhas / Cotton-top Tamarin (Saguinus oedipus) conservation, littered bottles that have been collected and will be made into fence poles, Proyecto Titi, Colombia

Suzi Eszterhas / Cotton-top Tamarin (Saguinus oedipus) biologist, Francy Forero, with conservationist and titi pole, which are fence poles made out of littered plastic bottles, Proyecto Titi, Colombia