Described as opportunistic, the masked titi feeds on the leaves, flowers, fruit and seeds of a wide variety of plant species (8) (9). The diet of the masked titi changes with season. In the dry season, more seeds are taken (9) and the foraging range is reduced (10), whereas in the warmer months, more fruit is eaten (11). The masked titi has also been observed feeding alongside Geoffroy’s tufted-eared marmosets, (Callithrix geoffroyi) (7).
The masked titi is monogamous and lives in groups of two to six individuals, usually consisting of a breeding pair and its offspring (12). Infants are born between August and October (7). The male becomes the principle care giver for young when they are one week old, carrying them for the majority of the time (4). Titi monkeys have a unique system of reinforcing social bonds, whereby group members groom each other, huddling together with their tails entwined as they sleep (4).
The masked titi is diurnal and active for around 12 hours a day, the majority of which is spent resting, travelling and feeding (11). Usually, particular boughs of trees are used by the masked titi for sleeping overnight. The adult males are usually the last to leave the sleeping trees in the morning (4).