White-eared titi of 11.5 hours, 2.7 hours of which is spent feeding. Titi monkeys sleep on branches at least above the ground. In the same manner as resting during the day, titi monkeys huddle together and twine tails to sleep. Though there is little published research on the diet of the white-eared titi, titi monkeys in general are omnivores that eat fruit, leaves, insects, and seeds. They mostly eat leaves, especially protein-rich young leaves and leaf buds, so a significant period of the day is spent resting to digest the cellulose. They consume more than 100 different species of plants and fruit.
Ornate titi daily activity lasts for around 11.5 hours, with feeding taking up around 2.7 hours. Their day is typically split into two feeding sessions, one in the morning and one in the evening, with a resting session at around midday. The last few hours of the day are generally spent feeding on leaves. The predominant and most important predators of all titis are raptors. Several species of raptor have been observed attacking a titi, including the Guianan crested eagle ("Morphnus guianensis") and the Ornate hawk-eagle ("Spizaetus ornatus"). Tufted capuchins ("Cebus apella") have also been observed killing and consuming an ornate titi.