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.

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

Gabriel Rojo / Brown striped tufted capuchin monkey (Sapajus apella) resting in tree. Amazon rainforest, Mato Grosso Brazil.

Bernard Castelein / Guianan brown capuchin, (Sapajus apella), walking up branch, Municipal protected area of Pampas del Yacuma, Bolivia

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

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

Bernard Castelein / Guianan brown capuchin (Sapajus apella), Madidi NP, Bolivia