Nick Hawkins / White-faced capuchin monkey (Cebus capucinus) in Tenorio Volcano National Park, Costa Rica

Bernard Castelein / Guianan brown capuchin (Sapajus apella) chewing on branch, Pampas del Yacuma Protected Area, Bolivia

Alex Hyde / Brown / Tufted Capuchin (Cebus apella) family group in cloud forest, Manu Biosphere Reserve, Peru.

Mark Bowler / Black capuchin, (Sapajus nigritus) female standing on hind legs, Rio de Janeiro, Brazil.

Ben Cranke / Black-striped capuchin (Sapajus libidinosus) using rock as a tool to break open palm nut, Parnaiba Headwaters National Park, Piaui, Brazil. August.

Ben Cranke / Black-striped capuchin (Sapajus libidinosus) using rock as a tool to break open palm nut Parnaiba Headwaters National Park, Piaui, Brazil. July.

Ben Cranke / Black-striped capuchin (Sapajus libidinosus) using rock as a tool to break open palm nut, Parnaiba Headwaters National Park, Piaui, Brazil. July.

Ammonite / Male White-throated / White-faced capuchin (Cebus capucinus) climbing and jumping in canopy, showing use of prehensile tail, Santa Rosa National Park, Costa Rica.

Ammonite / White-throated capuchins (Cebus capucinus) alarm calling, Santa Rosa National Park, Costa Rica.

Ammonite / White-throated / White-faced capuchin (Cebus capucinus) climbing and playing with twig, showing use of prehensile tail, Santa Rosa National Park, Costa Rica.

Ammonite / Family of White-throated / White-faced capuchins (Cebus capucinus) resting and grooming each other, Santa Rosa National Park, Costa Rica.

Mary McDonald / Black striped capuchin (Sapajus libidinosus) using rocks to crack nuts, Piaui, Brazil

Mary McDonald / Black striped capuchin (Sapajus libidinosus) using rocks to crack nuts, Piaui, Brazil

Mary McDonald / Black striped capuchin (Sapajus libidinosus) using rocks to crack nuts, with young animal watching and learning, Piaui, Brazil

Mary McDonald / Black striped capuchin (Sapajus libidinosus) using rocks to crack nuts, Piaui, Brazil

Mary McDonald / Black striped capuchin (Sapajus libidinosus) using rock to crack nuts, Piaui, Brazil

Mary McDonald / Black striped capuchin (Sapajus libidinosus) using rocks to crack nuts, Piaui, Brazil

Pete Oxford / White-fronted capuchin monkey (Cebus albifrons) drinking from a discarded coke bottle, Puerto Misahualli, Amazon rainforest, Ecuador, South America January 2005 December 2004

Pete Oxford / White-fronted capuchin monkey (Cebus albifrons)digging on the beach for food, Puerto Misahualli, Amazon rainforest, Ecuador, South America

Pete Oxford / White-fronted capuchin monkey (Cebus albifrons)emerging from river with food, Puerto Misahualli, Amazon rainforest, Ecuador, South America

Fabio Liverani / Large headed capuchin (Sapajus macrocephalus) resting in tree, Monkey Island, River Maldonado, Tambopata National Reserve, Amazonia, Peru

Pete Oxford / White fronted capuchin monkey with baby, Amazon, Ecuador

Pete Oxford / White fronted capuchin monkey, Amazon, Ecuador

Pete Oxford / White fronted capuchin monkey {Cebus albifrons} in tree, Amazon rainforest, Ecuador, South America

David Tipling / Large headed capuchin (Sapajus macrocephalus). Cloud Forest, Manu NP, Peru, South America

JIM CLARE / Large headed capuchin (Sapajus macrocephalus) monkey feeding on Maticia flowers, Manu NP, Peru.

Suzi Eszterhas / Brown capuchin monkey (Sapajus apella). Pantanal, Brazil.

Konrad Wothe / Young Spix's white-fronted capuchin monkey (Cebus unicolor) rainforest, Amazon, Brazil.

David Pattyn / White-faced Capuchin (Cebus capucinus imitator) Carara National Park, Costa Rica

David Pattyn / White-faced Capuchin (Cebus capucinus imitator) Manuel Antonio National Park, Quepos, Costa Rica

David Pattyn / White-faced Capuchin (Cebus capucinus imitator) Manuel Antonio National Park, Quepos, Costa Rica

David Pattyn / White-faced Capuchin (Cebus capucinus imitator) Manuel Antonio National Park, Quepos, Costa Rica

David Pattyn / White-faced Capuchin (Cebus capucinus imitator) killing and eating a young Green Iguana (Iguana iguana) Manuel Antonio National Park, Quepos, Costa Rica

David Pattyn / White-faced Capuchin (Cebus capucinus imitator) with one arm leg missing walking on electrical wires in Quepos at the edge of Manuel Antonio National Park, Quepos, Costa Rica

David Pattyn / White-faced Capuchin (Cebus capucinus imitator) with one arm leg missing walking on electrical wires in Quepos at the edge of Manuel Antonio National Park, Quepos, Costa Rica

David Pattyn / White-faced Capuchin (Cebus capucinus imitator) female with a young one in a tree Corcovado National Park, Osa peninsula, Costa Rica

Morley Read / Female White-fronted capuchin (Cebus albifrons) grooming a younger female, Ecuador.

Morley Read / Female White-fronted capuchin (Cebus albifrons) grooming a younger female, Ecuador.

Morley Read / Female White-fronted capuchin (Cebus albifrons) grooming a younger female, accompanied by a baby, Ecuador.

Morley Read / Female White-fronted capuchin (Cebus albifrons) with baby, Ecuador.

Morley Read / Female White-fronted capuchin (Cebus albifrons) feeding on palm weevil larvae, with two juveniles, Ecuador.

Doug Wechsler / White-fronted capuchin monkey (Cebus albifrons) male, Copalinga Reserve, Ecuador,

Doug Wechsler / White-fronted capuchin monkey (Cebus albifrons) male, Copalinga Reserve, Ecuador.

Nick Hawkins / Ecuadorian white-fronted capuchin (Cebus aequatorialis) in cloud forest, Choco region, Northwestern Ecuador. Critically Endangered.

Nick Hawkins / Ecuadorian white-fronted capuchin (Cebus aequatorialis) in cloud forest, Choco region, Northwestern Ecuador.Critically Endangered.

Nick Hawkins / Ecuadorian white-fronted capuchin (Cebus aequatorialis) in cloud forest, Choco region, Northwestern Ecuador.Critically Endangered.

Nick Garbutt / RF - Black-striped tufted capuchin (Cebus libidinosus) in deciduous forest along the banks of the Pixiam River, Northern Pantanal, Brazil. (This image may be licensed either as rights managed or royal...

Gabriel Rojo / Brown striped tufted capuchin monkey (Sapajus apella). Pantanal, Mato Grosso Brazil.