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.

Karine Aigner / Scaled quail (Callipepla squamata) perched on branch. Texas, USA. June.

Karine Aigner / Scaled quail (Callipepla squamata) perched on branch. Texas, USA. June.

Karine Aigner / Scaled quail (Callipepla squamata) perched on branch. Texas, USA. June.

Karine Aigner / Scaled quail (Callipepla squamata) pair face to face. Texas, USA. June.

Karine Aigner / Scaled quail (Callipepla squamata) perched on branch. Texas, USA. June.

Karine Aigner / Scaled quail (Callipepla squamata) chick walking along branch. Texas, USA. June.

Karine Aigner / Scaled quail (Callipepla squamata) female and chick perched on branch. Texas, USA. June.

Cyril Ruoso / Scaled quail (Callipepla squamata) South Texas, USA, April.

Floris van Breugel / Sunrise over Death Valley (from Corkscrew Peak) with Cottontop cactus (Echinocactus polycephalus). View extending all the way to Badwater (center left near the horizon), the Mesquite Dunes (right),...

Floris van Breugel / Cotton top cactus (Echinocactus polycephalus) among rocks, Death Valley National Park, California, USA, August.

Roland Seitre / Cotton-top tamarin (Saguinus oedipus) captive at Cali Zoo, Valle del Cauca, Colombia. Endemic to Colombia. Critically endangered species.

Roland Seitre / Cotton-top tamarin (Saguinus oedipus) captive at Cali Zoo, Valle del Cauca, Colombia. Endemic to Colombia. Critically endangered species.

Roland Seitre / Cotton-top tamarin (Saguinus oedipus) captive at Cali Zoo, Valle del Cauca, Colombia. Endemic to Colombia. Critically endangered species.

Roland Seitre / Cotton-top tamarin (Saguinus oedipus) captive at zoo, Cali, Valle del Cauca, Colombia. Critically endangered species. Endemic to Colombia.

Jouan Rius / Cottontop cactus (Echinocactus polycephalus) Valley of Fire State Park, Nevada, USA, January 2013.

Jack Dykinga / Cottontop cactus (Echinocactus polycephalus) at dawn, near Arizona/Mexican border with Tinajas Altas Mountains, Cabez Prieta National Wildlife Refuge, Arizona, USA

Luiz Claudio Marigo / Cotton-top Tamarin / Cotton-headed Tamarin (Saguinus oedipus) on branch. Tropical Rainforest of Tayrona Natural National Park, municipality of Santa Marta, Magdalena Department, Colombia.

Daniel Heuclin / Cottontop cactus (Echinocactus polycephalus) Death Valley National Park, California, USA, August

Daniel Heuclin / Cottontop cactus (Echinocactus polycephalus) Death Valley National Park, California, USA, August

Rod Williams / Cotton-top Tamarin (Saguinus oedipus) portrait sitting in tree. Captive, found in NW Colombia. Critically Endangered.

Rod Williams / Cotton-top Tamarin (Saguinus oedipus) portrait of juvenile, sitting in tree. Captive, found in NW Colombia. Critically Endangered.

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) stretchng on tree trunk, in tropical dry forest of Colombia, South America. IUCN List: Critically Endangered

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

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

Lisa Hoffner / Wild Cotton-top tamarin (Saguinus oedipus) clings to a branch after rainstorm in the dry tropical forest of Colombia, South America. IUCN List: Critically Endangered

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

Lisa Hoffner / Wild Cotton-top tamarin (Saguinus oedipus) male carrying a baby on his back in the dry tropical forest of Colombia, South America. IUCN List: Critically Endangered

Lisa Hoffner / Biologist Luis Soto inspects a caterpillar on end of stick. These are a food source for the Cotton-top Tamarins (Saguinus Oedipus) Colombia, South America. July 2008

Lisa Hoffner / Two Wild Cotton-top tamarins (Saguinus oedipus) face-pressing (never before photographed behaviour). Colombia, South America IUCN List: Critically Endangered

Lisa Hoffner / Conservation biologist and founder of the Proyecto Titi conservation programme Anne Savage looking over cattle pasture, which was once prime Cotton-top tamarin habitat. Colombia. South America. July 2...

Lisa Hoffner / Conservation biologist and founder of the Proyecto Titi conservation programme Anne Savage observes a Cotton-top tamarin (Saguinus oedipus) in dry tropical forest of Colombia, South America IUCN List:...

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

Lisa Hoffner / Conservation biologist and founder of the Proyecto Titi conservation programme Anne Savage radio tracking Cotton-top tamarins (Saguinus oedipus) in dry tropical forest of Colombia, South America IUCN...

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

Lisa Hoffner / Wild Cotton-top tamarin (Saguinus oedipus) wearing a radio-collar, climbing the trunk of a tree in dry tropical forest of Colombia, South America IUCN List: Critically Endangered

Lisa Hoffner / Forest wood and charcoal bags at the dry tropical forest edge. This was once prime Cotton-top tamarin (Saguinus oedipus) habitat. Colombia, South America. February 2008

Lisa Hoffner / Cattle grazing up to dry tropical forest edge. This pasture was once prime Cotton-top tamarin (Saguinus oedipus) habitat. Colombia, South America. February 2008

Lisa Hoffner / Wild Cotton-top tamarin (Saguinus oedipus) climbing head first down the trunk of a tree in dry tropical forest of Colombia, South America. IUCN List: Critically Endangered

Lisa Hoffner / Wild Cotton-top tamarin (Saguinus oedipus) resting on branch in dry tropical forest of Colombia, South America. IUCN List: Critically Endangered

Lisa Hoffner / Motorcycle whizzes past pasture and half-denuded hill (once Cotton-top tamarin habitat). Colombia, South America

Lisa Hoffner / Colombian boy collects plastic bags for use in eco-mochilas (bags). This project has recycled more than 1.5 million plastic bags and provides an income to the village living around the forest thereby...

Lisa Hoffner / Two Wild Cotton-top tamarins (Saguinus oedipus) face-pressing (never before photographed behaviour). Colombia, South America IUCN List: Critically Endangered

Lisa Hoffner / Portrait of a wild Cotton-top tamarin (Saguinus oedipus) close-up. Colombia, South America IUCN List: Critically Endangered

Lisa Hoffner / Portrait of a wild Cotton-top tamarin (Saguinus oedipus) stretching out during the heat of the day in dry tropical forest of Colombia, South America IUCN List: Critically Endangered

Lisa Hoffner / Researcher analyses Cotton-top tamarin fecal sample. Colombia, South America

Lisa Hoffner / Young girl runs past mural which promotes protection of the Cotton-top tamarin. Los Limites, Colombia, South America. February 2008

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

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

Lisa Hoffner / Wild Cotton-top tamarin (Saguinus oedipus) standing on back legs (behavior never observed or photographed before) in the dry tropical forest of Colombia, South America IUCN List: Critically Endangere...

Lisa Hoffner / "Titienda" shop - owner with grandson tending their small grocery store in Los Limites, Colombia. Advertising the presence of the cotton-top tamarin in their forests helps educate the community and is...

Lisa Hoffner / Wild Cotton-top tamarin (Saguinus oedipus) appears to fly through the air as it jumps from branch to branch (never before photographed) in the dry tropical forest of Colombia, South America IUCN List...

Lisa Hoffner / Wild Cotton-top tamarin (Saguinus oedipus), climbing tree in the dry tropical forest carrying less-than-a week old baby on his back. Colombia, South America IUCN List: Critically Endangered

Lisa Hoffner / Wild Cotton-top tamarin (Saguinus oedipus) appears to fly through the air as it jumps from branch to branch (never before photographed) in the dry tropical forest of Colombia, South America IUCN List...

Lisa Hoffner / Wild Cotton-top tamarin (Saguinus oedipus) appears to fly through the air as it jumps from branch to branch (never before photographed) in the dry tropical forest of Colombia, South America IUCN List...

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

Lisa Hoffner / Wild Cotton-top tamarin (Saguinus oedipus) feeding on seasonal berries, Patica de Paloma (Stylogyne turbacensis), in dry tropical forest of Colombia, South America IUCN List: Critically Endangered

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

Lisa Hoffner / Wild Cotton-top tamarins (Saguinus oedipus) play fighting (never before photographed behavior) in the dry tropical forest of Colombia, South America IUCN List: Critically Endangered

Lisa Hoffner / Juvenile cotton-top tamarin (Saguinus Oedipus) vocalizing in the dry tropical forest of Colombia, South America. IUCN List: Critically Endangered

Lisa Hoffner / Wild Cotton-top tamarin (Saguinus oedipus) leaping from tree to tree carrying baby, in dry tropical forest of Colombia, South America IUCN List: Critically Endangered

Lisa Hoffner / Mochilas and other products woven from recycled plastic bags. This project has recycled more than 1.5 million plastic bags and provides an income to the village living around the forest thereby prot...

Lisa Hoffner / Colombian woman knitting mochilas and other products woven from recycled plastic bags. This project has recycled more than 1.5 million plastic bags and provides an income to the village living around...

Lisa Hoffner / Colombian man cutting strips of recycled plastic bags to be woven into products.This project has recycled more than 1.5 million plastic bags and provides an income to the village living around the for...

Lisa Hoffner / Colombian girls performing the Cotton-top tamarin dance during the official " Day of the Tamarin" celebration. Los Limites, Colombia, South America. February 2008

Lisa Hoffner / Proyecto Titi team performing Cotton-top tamarin census in Colombia's dry tropical forest. Colombia, South America. February 2008

Lisa Hoffner / Wild Cotton-top Tamarins in line (Saguinus Oedipus) sitting on tree branch in dry tropical forest of Colombia, South America IUCN List: Critically Endangered

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

Jack Dykinga / Cottontop cactus (Echinocactus polycephalus) with dawn light, Goldwater Range, Arizona

Jack Dykinga / Vehicle tracks winding around a Cottontop Cactus (Echinocactus polycephalus), Cabeza Prieta National Wildlife Refuge, Arizona

Rod Williams / Cotton-top tamarin {Saguinus oedipus} captive, from NW Colombia

Rod Williams / Cotton-top tamarin {Saguinus oedipus} captive, from NW Colombia

Miles Barton / Cotton-top tamarin (Saguinus oedipus) captive, from South American rainforest

LYNN M. STONE / Cotton top tamarin {Saguinus oedipus} captive

LYNN M. STONE / Cotton top tamarin {Saguinus oedipus} captive

Miles Barton / Cotton-top tamarin. C (Saguinus oedipus) (9.23)

Anup Shah / Head profile of Cottontop tamarin {Saguinus oedipus} endangered species native to South America

LYNN M. STONE / Cotton top tamarin {Saguinus oedipus} sitting on branch. Captive