Monkey Species · Western Amazon basin
Pygmy Marmoset
The pygmy marmoset (genus Cebuella) is the world's smallest monkey, weighing only about 100 grams.
By the WARN Research & Conservation TeamChecked against IUCN Red List & CITES sourcesLast updated
In brief
The pygmy marmoset (genus Cebuella) is the world's smallest monkey, weighing only about 100 grams. A western-Amazon specialist that gouges tree bark to feed on gum, it lives in small family groups and is collected for the pet trade despite faring poorly in captivity.
Pygmy Marmoset: At a Glance
| Origin | Western Amazon basin |
|---|---|
| Size | Tiny (~100–140 g) |
| Typical weight | Around 100–140 g — the world's smallest monkey |
| Lifespan | 11–16 years (wild); up to ~20 in good captivity |
| Coat & markings | Tawny-agouti fur with a ringed tail; squirrel-like build |
| Temperament | Active, secretive, gum-feeding |
| Conservation note | CITES Appendix II and collected for the pet trade — a poor captive animal; verify current IUCN status before quoting a category |
History & Origins
The pygmy marmoset clings to tree trunks like a squirrel, gnawing holes to feed on sap and gum. It lives in cooperative family groups in the western Amazon, with shared infant care. Its tiny size and appeal drive a damaging pet trade; it is CITES-listed, and buyers should never support wild capture.
Pygmy Marmoset Fun Facts
- The pygmy marmoset is the smallest monkey in the world.
- It gouges tree bark with specialised teeth to feed on gum and sap.
- It can turn its head almost 180 degrees to watch for predators.
- Family groups share the carrying of infants.
Pygmy Marmoset Common Health Issues
Conditions seen more often in this breed, and how owners and vets help manage them. This is general guidance, not veterinary advice — always speak to your vet.
Pet trade welfare issues
Monkeys taken for the pet trade are usually removed from their mothers as infants, causing lasting behavioural and physical harm; most cannot be rehabilitated.
Care: Never buy or share content normalising primate pets; support sanctuaries and anti-trafficking work.
Gum disease
Gum-feeding marmosets and tamarins on poor captive diets develop dental and gum disease and metabolic bone disease.
Care: Specialist diets and veterinary dental care are essential — another reason these species fare badly as pets.
Habitat loss (wild)
Deforestation for agriculture, logging and development removes the food trees and connected canopy that wild monkeys depend on.
Care: Support habitat protection and deforestation-free supply chains in range countries rather than wildlife tourism that disturbs troops.
Monkeys belong in the wild
Monkeys are intelligent, social primates — not pets. The illegal pet trade and habitat loss threaten species from marmosets to macaques. WARN funds anti-trafficking and habitat work for primates in our partner countries.
