Atlantic titi the general area. Additionally, all titi monkeys have "Dawn Calls" in the mornings in which the male and female usually duet the same song. Atlantic titi The Atlantic titi or masked titi ("Callicebus personatus") is a species of titi, a type of New World monkey, endemic to Brazil. The Atlantic titi is part of the genus "Callicebus" which is composed of thirteen species and sixteen subspecies. More specifically, they belong to the group "Callicebus moloch" which is composed of eight species and eight subspecies. Three subspecies of "Callicebus personatus" have been described in scientific literature: "C.p. melanochir", "C.p. nigrifrons", 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,