Mark Bowler / Dusky titi monkey {Callicebus moloch} feeding on rainforest fruits, Yavari River, Amazon, Peru

Thomas Marent / Coppery Titi (Callicebus cupreus) mother carrying young, native to Brazil

Mark Bowler / Widow Monkey / Yellow-handed Titi Monkey (Callicebus torquatus lucifer / Callicebus lucifer), captive, Peru

Rod Williams / Red / Coppery Titi monkey (Callicebus cupreus) head portrait climbing down tree trunk. Captive, found in Brazil and Peru.

Lisa Hoffner / Red howler monkey (Alouatta seniculus) with baby on back, in the dry tropical forest of Colombia, South America.

Murray Cooper / Coppery Titi (Callicebus cupreus) monkey in canopy, Ecuador

Murray Cooper / Coppery Titi (Callicebus cupreus) monkey in canopy, Ecuador

Rod Williams / Coppery / Red Titi monkey (Callicebus cupreus) pair grooming, captive from Brazil and Peru

Mark Bowler / Red / Coppery Titi Monkey {Callicebus cupreus} captive, from Brazil, Colombia, Ecuador and Peru

Mark Bowler / Andean / Rio mayo titi monkey (Callicebus oenanthe) sitting in tree, Alto Mayo, Peru, Endangered species

Thomas Marent / Coppery Titi (Callicebus cupreus) monkey, Amacayacu National Park, Colombia

Luiz Claudio Marigo / Black-fronted / Masked titi monkey (Callicebus nigrifrons) with young in Atlantic Rainforest, Minas Gerais State, Southeastern Brazil.

Kevin Schafer / Urubamba Brown Titi Monkey (Callicebus urubambensis) juvenile, Tambopata National Reserve, Peru

Rod Williams / Male Red titi monkey (Callicebus cupreus) carrying baby, Captive, found in Brazil/Peru

Rod Williams / Red Titi monkey (Callicebus cupreus) captive, from Brazil and Peru

JIM CLARE / Two Dusky titi monkeys {Callicebus moloch} on branch, Amazon, South America

Miles Barton / Dusky titi monkey {Callicebus moloch} young, captive, from South America

Miles Barton / Dusky titi monkey {Callicebus moloch} male carrying 4-month young on his back, captive, from South America

JIM CLARE / Dusky titi monkey (Callicebus moloch) pair with young, Amazonia, South America

Rod Williams / Dusky titi monkeys {Callicebus moloch} female with young, captive from Amazonia

Luiz Claudio Marigo / Masked titi monkey {Callicebus nigrifrons} atlantic rainforest, Brazil

Luiz Claudio Marigo / Dusky titi monkey {Callicebus moloch} Amazonas, Brazil

Luiz Claudio Marigo / Dusky titi monkey {Callicebus moloch} Amazonas, Brazil

Dave Watts / Dusky Titi monkey (Callicebus moloch) in tree,Captive

Rod Williams / Red Titi monkey {Callicebus cupreus} captive