Caquetá titi agricultural activity, and dispersal is hazardous since it must cross open savanna or barbed wire in order to reach new nearby forest fragments. The species has a geographic range of just about and actually occupies only about within that range. All 13 groups studied consisted of a single adult male, a single adult female and between one and four immature monkeys. Average group size, including adults and immatures, was 4.1 monkeys. This is consistent with other titi monkey species, which form small, cohesive groups led by a bonded pair of adults. Like other titi monkey species, they are monogamous and
Collared titi is found west of the Río Purús to the Yavarí River. The collared titi is seen most frequently in well-developed, tall forest with a closed canopy, usually over terra firme, but not exclusively so. The species also enters extensive várzea forest, especially if the forest is tall and well-developed. Such várzea forest contrasts with the habitat needs of the coppery titi, which also uses várzea forest and more commonly so. But the coppery titi survives in low, vine-covered, "poor" forest where the collared titi is rarely found. It is also known from some gallery forest, north of the Vichada River,