Humboldt's Night Monkey, the red-necked version. Also known as an owl monkey due to nocturnal habits. Found through much of the western Amazon basin, photo from Sacha Lodge Resort, eastern Ecuador. In context at www.dixpix.ca/Amazon/fauna/primates/index.html
Native to eastern Bolivia and Paraguay, the White-eared Titi Monkey is locally known as the Huicoco de Bolivia. Photo from Santa Barbara Zoo, California. In context at www.dixpix.ca/Amazon/fauna/primates/index.html
The Sunda Pigtail Macaque is found from Thailand to Sumatra and Borneo. Here at the Sepilok Reserve in northeastern Sabah Province of Borneo, it is known as Beruk.In context at www.dixpix.ca/indonesia/fauna/primates/index.html
It is known as the Black Howler, but only the males are black. It ranges from eastern Bolivia to northern Argentina. This one is at the Mendoza Zoo in the latter. Locally known as Mono Caraya. In context at www.dixpix.ca/Amazon/fauna/primates/index.html