Nick Gordon / Silky marmosets {Callithrix humeralifer chrysoleuca} aggression, Amazonia, Brazil

Luiz Claudio Marigo / Wied's black tufted-ear marmoset (Callithrix kuhli) clinging to branch in mountainous Atlantic Rainforest of Serra Bonita Natural Private Heritage Reserve (RPPN Serra Bonita), municipality of Camacan,...

Nature Production / Pygmy Marmoset (Cebuella pygmaea) clinging to fingers, captive

Nick Gordon / Silky marmoset, male carrying twin babies (Callithrix humeralifer chrysoleuca) Amazonia, Brazil

Claus Meyer / Pygmy Marmoset (Cebuella pygmaea) endangered, pair, world's smallest primate, Amazon, Brazil

Tony Heald / Geoffroy's marmoset on branch

Rod Williams / Young Common marmosets {Callithrix jacchus} native to north-east Brazil, S America

Pete Oxford / White eared marmoset {White Tufted-ear Marmoset} Brazil, South America

Ernie Janes / Common marmoset (Callithrix jacchus) two marmosets, captive, with digitally added leaves.

Ernie Janes / Common marmoset (Callithrix jacchus) portrait, captive, endemic to Brazil. With digitally added leaves.

David Perpinan / Common marmoset (Callithrix jacchus) juvenile with metabolic bone disease. This is a common disease in captivity caused by inadequate husbandry. Small repro only