Christophe Courteau / Red Uakari Monkey {Cacajao rubicundus} jumping from branch to branch. Mamiraua Wildlife Reserve. Amazonia, Brazil

Juan Manuel Borrero / White bald-headed uakari (Cacajao calvus) head portrait. Amazon basin. Iquitos. Loreto. Peru, Captive

Mark Bowler / Peruvian red uakari monkey (Cacajao calvus ucayalii) eating aguaje palm fruits (Mauritia flexuosa) Yavari River, Peru, vulnerable species, wild

Claus Meyer / Red Uakari (Cacajao rubicundus) male feeding on fruit, Amazon ecosystem, Brazil

Staffan Widstrand / Black-headed uakari monkey {Cacajao melanocephalus} on branch. Manaus, Brazil.

Pete Oxford / Red uakari monkey in tree Amazon rainforest, Brazil, South America

Christophe Courteau / Red Uakari Monkey {Cacajao rubicundus} jumping from branch to branch. Mamiraua Wildlife Reserve. Amazonia, Brazil

Rod Williams / Red uakari monkey (Cacajao calvus rubicundus), female, Captive, occurs Amazon Basin, Brazil, Peru, South America, Endangered.

Mark Bowler / Peruvian red uakari monkey (Cacajao calvus ucayalii) adult male in hanging display. Yavari River, Peru, vulnerable species, wild

Mark Bowler / Peruvian red uakari monkey (Cacajao calvus ucayalii) eating aguaje palm fruits (Mauritia flexuosa) Yavari River, Peru, vulnerable species, wild

Mark Bowler / Peruvian red uakari monkey (Cacajao calvus ucayalii) in rainforest tree, Yavari River, Peru, wild, vulnerable species

Mark Bowler / Peruvian red uakari monkey (Cacajao calvus ucayalii) feeding in rainforest tree, Yavari River, Peru, vulnerable species, wild

Mark Bowler / Peruvian red uakari monkey (Cacajao calvus ucayalii) baby with fingers in mouth, captive, vulnerable species

Luiz Claudio Marigo / Male Red Uakari (Cacajao calvus rubicundus) resting in canopy of Amazon Rainforest, Amazonas State, Northern Brazil. Endangered

Luiz Claudio Marigo / Female Red Uakari (Cacajao calvus rubicundus) resting in canopy of Amazon Rainforest, Amazonas State, Northern Brazil. Endangered

Luiz Claudio Marigo / Female Red Uakari monkey (Cacajao calvus rubicundus) in Amazon Rainforest, Amazonas State, Northern Brazil. Endangered

Luiz Claudio Marigo / Male Red uakari monkey (Cacajao calvus rubicundus) in Amazon rainforest, Amazonas State, Northern Brazil. Endangered

Nick Gordon / White uakari monkey (Cacajao calvus) in rainforet canopy searching for food, Amazonia, Brazil

Pete Oxford / Red uakari monkey in tree {Cacjao rubicundus} captive, Amazon Brazil, South America

Pete Oxford / Red uakari monkey in tree {Cacjao rubicundus} Amazonia, Brazil, captive

Pete Oxford / Red uakari monkey {Cacjao rubicundus} Amazonia, Brazil, captive

Pete Oxford / Red uakari monkey in tree {Cacjao rubicundus} Amazonia, Brazil, captive

Rod Williams / Red Uakari monkey {Cacajao rubicundus} male, captive, from Brazil and Colombia

JIM CLARE / Male White uakari monkey (Cacajao calvus) Brazil, Amazonia, South America

Luiz Claudio Marigo / White uakari monkey hanging {Cacajao calvus} Mamiraua reserve, Amazonas, Brazil

Luiz Claudio Marigo / White uakari monkey, female {Cacajao calvus} Amazonas, Brazil

Luiz Claudio Marigo / White uakari monkey {Cacajao calvus} Mamiraua reserve, Amazonas, Brazil

Luiz Claudio Marigo / White uakari monkey feeding {Cacajao calvus} Mamiraua reserve, Amazonas, Brazil

Luiz Claudio Marigo / White uakari monkey, female {Cacajao calvus} Amazonas, Brazil

Luiz Claudio Marigo / White uakari monkey {Cacajao calvus} Mamiraua reserve, Amazonas, Brazil

Pete Oxford / Red uakari monkey {Cacjao rubicundus} in tree, Amazon Brazil, South America - captive

Staffan Widstrand / Black headed uakari monkey {Cacajao melanocephalus} Manaus, Brazil, South America

Staffan Widstrand / Black headed uakari monkey {Cacajao melanocephalus} Manaus, Brazil, South America

Staffan Widstrand / Black-headed Uakari monkey {Cacajao melanocephalus} Manaus, Brazil

Claus Meyer / Red Uakari (Cacajao calvus) feeding on fruit, Amazon ecosystem, Brazil

Claus Meyer / White Bald-headed Uacari (Cacajao calvus calvus) portrait, Amazon forest, Brazil

Claus Meyer / Black Uakari (Cacajao melanocephalus) portrait, Amazon forest, Brazil

Claus Meyer / White Bald-headed Uacari (Cacajao calvus calvus) portrait, Amazon forest, Brazil

Pete Oxford / Red uakari monkey portrait {Cacjao rubicundus} Amazon Brazil, South America captive

Claus Meyer / Black Uakari (Cacajao melanocephalus) portrait, Amazon forest, Brazil

Pete Oxford / Red uakari monkey in tree {Cacjao rubicundus} Amazon Brazil, South America captive

Pete Oxford / Red uakari monkey in tree {Cacjao rubicundus} Amazon Brazil, South America captive

Pete Oxford / White uakari monkey C {Cacajao calvus calvus} Mamiraua Brazil

Pete Oxford / White uakari monkey C {Cacajao calvus calvus} Mamiraua Brazil