Their diet mainly consists of fruits, nectar, gum exudates, invertebrates and small vertebrates.

Exudates supplement nutrients and balance mineral intake; which prevent the species from experiencing a range of detrimental effects from a low-calcium and high-phosphorus insectivorous diet.

They display a highly opportunistic foraging pattern, and the ratio and variety of their comestibles depend on the availability in their geographical location.

This higher volume of nectar makes the chosen trees more reliable because it allows them to feed for longer periods.

Spatial memory is vital because it aids in the exploitation of a widely scattered set of feeding sites and minimizes effort in foraging.

[5] The moustached tamarin monkey is a crucial seed disperser for many plant species as a result of their diverse diet.

They are opportunistic feeders, utilizing a wide range of plant resources, allowing them to disperse a variety of seed species, providing significant benefit to their ecosystem.

[4] These species can cohabit because they have varying locomotor types, hunting techniques, support preference, food selection, and reside in different strata of their forest habitat.

Sharing territory with another species facilitates predator avoidance, increasing survival chances for both groups.

They perform “bounding” leaps which allow them to cross between discontinuous trees, extending their legs farther out, reaching up to 2 meters.

Moustached tamarin monkeys select densely foliated areas for resting and sleeping to best camouflage themselves because their small size makes them an easy target.

Their predators include eagles and other birds of prey, snakes, tayras, jaguarundis, ocelots and other wild cats.

The moustached tamarins use their claws to detangle and comb one another's hair and remove parasites and dirt with their teeth and tongue.

One of the adults positions themselves near the feeding site and scans the surroundings for predators to protect the group during mealtimes.

[4] There is often strife between neighboring groups of moustached tamarins due to limited food resources, especially near large feeding trees.

[4] Vocal battles can arise, with long calls that consist of short syllables at a high frequency.

[7] Fights can be more aggressive however, often including alarm calls, visual contact, scent marking and a series of chases and retreats.

[7] Vocalizations allow moustached tamarins to distinguish between individuals, organize group movements, and ensure all members are accounted for.

[5] In the morning, moustached tamarins make calls to each other to coordinate movement for the day towards specific foraging sites.

The reproduction season of the moustached tamarin monkey is November to March, during which the oldest female reproduces.

The eldest female frequently bears twins because they ovulate multiple ova during each reproductive cycle.