Marmoset Monkey

MammalsPrintable care sheet

The marmoset monkey (Callithrix spp.) is a tiny New World primate known for its expressive eyes, long tail, and distinctive ear tufts. They get their name from their quiet, murmuring vocalizations. Adults typically reach 7–12 inches (not including the tail) and live 10–16 years in human care.

Marmosets originate from the tropical forests of Brazil, thriving in warm, humid climates with dense trees. They are highly active, social, and vocal, living in family groups in the wild.

They are diurnal, sleeping at night and active during the day. Their appearance—slender body, claw-like nails, and long tail—comes from adaptations for climbing and leaping through treetops.

Fun facts: Marmosets rely heavily on sap, gum, and tree exudates, and they use their specialized lower incisors to gnaw into bark. They communicate using high-pitched chirps and can leap several body lengths.

Enclosure

Provide a tall enclosure, minimum 6 ft tall × 6 ft wide × 4 ft deep for one to two animals, with lots of branches, ropes, shelves, and enrichment.

Use safe mulch bedding, such as cypress mulch, to help maintain humidity.

Keep daytime temperatures 78–90°F with a drop to 75–80°F at night. They require 40–60% humidity, increased during shedding. No basking lamp is needed, but they benefit from full-spectrum lighting with UVB for bone and immune health.

Ideal temperature range: 78–90°F. They can tolerate mid-70s briefly but are sensitive to cold and drafts. Avoid temps above 95°F without ventilation, as heat stress occurs quickly.

Diet and Hydration

Weekly Feeding Pattern

Feed twice daily. Offer a base of high-quality marmoset diet (like Mazuri or ZuPreem) plus fresh produce and protein sources. Provide gum arabic or acacia gum daily to mimic natural exudate feeding.

Staples

Marmoset biscuits, gum arabic, acacia gum, hard-boiled egg pieces, insects (mealworms, crickets, dubia), cooked chicken, sweet potatoes, squash, mixed greens, blueberries, melon, banana (in moderation).

Treats

Papaya, mango, grapes (sparingly), apples, pears, carrots, yogurt drops (rare).

No Feed / Toxic

Avocado, caffeine, chocolate, onion, garlic, alcohol, raw potato, fruit pits, sugar-heavy foods, processed human foods.

Hydration

Provide fresh water daily in both a bowl and a sipper bottle, as some prefer one over the other. Offer diluted electrolyte water during heat or stress.

Supplements

Daily calcium with D3 (light dusting). Weekly multivitamin for primates. Marmosets are prone to metabolic bone disease, so UVB + calcium is essential.

Behavior note: Marmosets may guard food or stash items; offer multiple feeding locations to prevent resource guarding.

Health

Common risks include metabolic bone disease, diabetes, parasites, stomatitis, and respiratory infections.

They are also vulnerable to Herpes Simplex Virus Type 1, which is fatal to marmosets even from casual human contact (saliva, droplets). Avoid anyone with cold sores or recent outbreaks handling them.

Maintain strict hygiene and regular vet exams.

Handling

Marmosets can be skittish, energetic, and sensitive to overstimulation. They can become stressed with excessive handling or loud environments. Always move slow, calm, and steady when approaching.

Use two-hand support: one hand under the chest and one supporting the hindquarters. Never grab from above or restrain tightly—this causes panic.

They do best with short, positive sessions, not long handling periods.

Requirements for Show Animals

Not ideal for most kid-heavy environments.
They can be unpredictable, nip when overstimulated, and are easily stressed by noise and crowds.
They do not meet the “5-shows-a-day” requirement.
They poop frequently, especially when excited.
They cannot be boxed for long periods.