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.
Collared titi meat the species is found commonly close to Indian settlements. The species is classified "Least Concern" (formerly LR) in the IUCN Red List. Actually the Colombian black-handed titi may be slightly endangered due to its presence in a zone of heavy colonization, but presently it is classified LC with the other subspecies. Fortunately the Colombian black-handed titi is found in La Paya National Park in Colombia, although the park itself is very vulnerable to surrounding colonization. The Lucifer titi is protected in Colombia by Amacayacu National Park and Cahuinarí National Park, while the black titi may be protected in Chiribiquete