The nonprehensile tail is well haired and sometimes tufted at the tip. The pelage consists of long, soft hairs. A light-colored collar band is present on some species.
Some titi monkeys have a black band on the forehead, while others have a white band.
These monkeys, with their harmonious colors and thick, soft fur, are attractive animals. They have a small, rounded head and a somewhat flattened, high face. In general form and behavior, titi monkeys resemble Aotus. Titis are arboreal and diurnal forest dwellers. When progressing on all four limbs, Callicebus hunches its body, and the hind limbs are rotated outward.