Nick Gordon / Golden-white tassel-ear marmoset / Silky marmosets (Mico chrysoleucos / Callithrix chrysoleuca) aggression, Amazonia, Brazil

Kevin Schafer / Golden lion tamarin (Leontopithecus rosalia) wild, Poco das Antas Reserve, Atlantic Forest, Southeast Brazil, Critically endangered, November. Did you know? More than 400 Golden lion tamarins have bee...

Lisa Hoffner / Wild Cotton-top tamarin (Saguinus oedipus) appears to fly through the air as it jumps from branch to branch in the dry tropical forest of Colombia, South America. IUCN List: Critically Endangered

Lisa Hoffner / Wild Cotton-top Tamarin (Saguinus Oedipus) on vine, in tropical dry forest of Colombia, South America. IUCN List: Critically Endangered

Lisa Hoffner / Wild Cotton-top tamarin (Saguinus oedipus) hanging from hind legs (never before observed behaviour) in the dry tropical forest of Colombia, South America. IUCN List: Critically Endangered

Lisa Hoffner / Portrait of two wild Cotton-top Tamarins (Saguinus Oedipus) resting on vine in tropical dry forest of Colombia, South America. IUCN List: Critically Endangered

Lisa Hoffner / Portrait of wild Cotton-top tamarins (Saguinus oedipus) standing on a branch in dry tropical forest of Colombia, South America IUCN List: Critically Endangered

Nick Gordon / Golden-white tassel-ear marmoset / Silky marmoset, male carrying twin babies (Mico chrysoleucos / Callithrix chrysoleuca) Amazonia, Brazil

Rod Williams / Goeldis monkey {Callimico goeldii} lying on a branch. Captive from Brazil.

Rod Williams / Cotton-top tamarin {Saguinus oedipus} portrait. Captive, from Colombia.

Lynn M Stone / Emperor tamarin {Saguinus imperator} captive

Rod Williams / Golden lion tamarin {Leontopithecus rosalia} from Brazil, critically endangered species

Pete Oxford / Golden headed lion tamarin {Leontopithecus chrysomelas} occurs Bahia, Brazil

David Kjaer / Pygmy marmoset {Cebuella pygmaea} occurrs South America

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

Pete Oxford / Saddleback tamarin {Saguinus fuscicollis} feeding on Combretum assimile tree flowers/fruit, Madre de Dios rainforest, Peru, South America

Pete Oxford / Emperor tamarin {Saguinus imperator} in rainforest tree, Madre de Dios, Peru

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

Anup Shah / White lipped tamarin {Saguineus labiatus} native to South America

Anup Shah / Portrait of Golden headed lion tamarin {Leontopithecus chrysomelas} endangered species native to Brazil

Rod Williams / Portrait of Golden lion tamarin {Leontopithecus rosalia} occurs Brazil, Rio de Janeiro State

Anup Shah / Golden lion tamarin {Liontideus rasalia}

Pete Oxford / Pygmy marmoset in hand {Cebuella pygmaea} Amazonia, Ecuador

Tony Heald / Geoldi's marmoset portrait {Callimico geoldii}. Native to South America

Tony Heald / Geoffroy's marmoset on branch

JIM CLARE / Emperor tamarin, Amazon rainforest

Suzi Eszterhas / Black tufted marmoset (Callithrix penicillata) sitting amongst leaves in tree. Serra de Canastra National Park, Brazil.

Ernie Janes / Common marmoset (Callithrix jacchus) portrait, captive, occurs in Brazil.

Ernie Janes / Common marmoset (Callithrix jacchus) with head tilted, captive, occurs in Brazil.

Ernie Janes / White-headed marmoset or Geoffroy's marmoset (Callithrix geoffroyi). Captive.

Ernie Janes / RF - Common marmoset (Callithrix jacchus) sticking out tongue, Captive, with digitally added leaf pattern

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

Lucas Bustamante / Pygmy marmoset (Cebuella pygmaea) on tree trunk, Cuyabeno, Sucumbios, Ecuador.

David Perpinan / Common marmoset (Callithrix jacchus) in a cage in a rehabilitation centre, confiscated from illegal wildlife trade, Brazil.

Cyril Ruoso / Buffy-headed marmoset (Callithrix flaviceps) on tree trunk, Atlantic Forest, Minas Gerais, Brazil.

Cyril Ruoso / Buffy headed marmoset (Callithrix flaviceps) on branch with food in hand, Atlantic Forest, Minas Gerais, Brazil. Endangered species.

Five Films / Common marmoset (Callithrix jacchus) running along a branch and jumping from the end, Reserva Ecologica de Guapiacu, Rio de Janeiro, Brazil.

Five Films / Group of Common marmosets (Callithrix jacchus) eating bananas at a feeding station, Reserva Ecologica de Guapiacu, Rio de Janeiro, Brazil.

Five Films / Common marmoset (Callithrix jacchus) feeding on a branch before jumping off, Reserva Ecologica de Guapiacu, Rio de Janeiro, Brazil.

Five Films / Common marmoset (Callithrix jacchus) running along a branch and jumping from the end, Reserva Ecologica de Guapiacu, Rio de Janeiro, Brazil.

Ben Cranke / Common Marmoset (Calithrix jacchus) Piaui, Brazil, Hanging, sitting on a palm nut branch. July.

Ben Cranke / Common Marmoset (Calithrix jacchus) sitting on palm tree, Piaui, Brazil. August.

Ben Cranke / Common Marmoset (Calithrix jacchus) sitting on branch, Piaui, Brazil, July.

Ben Cranke / Black-tailed Marmoset (Mico melanurus) climbing tree, Mato Grosso, Pantanal, Brazil. July.

Ben Cranke / Black-tailed Marmoset (Mico melanurus) hanging, Mato Grosso, Pantanal, Brazil. July.

Ben Cranke / Common Marmoset (Calithrix jacchus) Piaui, Brazil, Hanging, sitting on a palm nut branch. July.