Owing to its rarity and the dearth of species-specific studies, very little is known about the biology of the blond titi monkey (1). However, titi monkeys tend to be largely arboreal forest dwellers, and the blond titi monkey probably rarely descends to the ground. These small, agile primates traverse the canopy with a distinctive gait, skilfully climbing through the branches on all four limbs, using their powerful rear limbs to jump spectacular distances, grasping onto branches with leading forehands. While resting, they hunch the body, hanging the tail vertically over a branch. Titi monkeys are most active at dawn and dusk, foraging for fruits, leaves and insects, and rest around midday. The males lead the group while foraging, communicating to the rest of the group with a wide array of vocalisations and visual signals. At night they sleep in carefully selected trees that offer safety from predators (5).
Titi monkeys are monogamous, with groups consisting of strongly-bonded parents and their offspring. Partners often reinforce the pair bond by perching side-by-side and entwining their tails (5). Females give birth annually, during the wet season, to a litter of just one, after a gestation period of five to six months (8). Juveniles grow rapidly to reach adult size within ten months (5).