Zoo Marmoset Welfare: Meeting the Needs of Small Primates

Common marmosets are among the most widely kept primates in zoos and research institutions, but their complex social and physical needs are frequently underestimated in standard husbandry.

Key Facts

Common marmosets are cooperative breeders in the wild, living in extended family groups of 3-15 individuals — solitary or pair housing fails to meet this fundamental social need.
Marmosets communicate through a sophisticated repertoire of vocalizations, scent marking, and facial expressions that require social partners to express fully.
In the wild, marmosets spend hours daily foraging for tree gum and insects across complex three-dimensional arboreal environments — typical zoo caging rarely replicates this.
Wasting marmoset syndrome — a chronic wasting condition associated with gastrointestinal inflammation — is linked in part to inappropriate diet and stress in captivity.
Marmosets are the most widely used non-human primate in biomedical research due to their small size, reproductive rate, and genetic tractability.
Callitrichid species including marmosets show clear evidence of emotional contagion, suggesting they can be distressed by the suffering of group members.

Welfare Considerations

The welfare needs of marmosets in captivity are frequently underestimated because of their small size and apparent adaptability. Their cooperative social structure means that welfare is fundamentally a group-level property — an individual marmoset without appropriate social partners, regardless of the quality of physical housing, is welfare-compromised in a deep way. Effective marmoset husbandry requires family group housing, complex three-dimensional environments with gum-feeding substrates, insect provisioning for hunting behavior, and careful attention to the vocalizations and behavior of all group members. In research settings, the Three Rs framework is particularly important for marmosets given their complex social lives and the chronic nature of many experimental protocols.

What You Can Do

Visit only accredited zoos with demonstrated marmoset group housing and enrichment programs.
Support primate welfare research that documents the welfare needs of callitrichid species in captive settings.
Advocate for mandatory group housing requirements for marmosets in both zoo and research settings.
Support organizations working to replace marmoset use in research with validated non-primate alternatives.
Do not purchase marmosets or other primates as pets — they have complex needs that cannot be met in household settings.