Titi monkeys are small monkeys from South America. They live in dense forests, jumping from branch to branch. They have very long but non-prehensile tails. They eat primarily plants, especially fruit.
Titi monkeys are highly monogamous, living in mated pairs with their immature offspring. They become distressed if separated from their life-mates. Titis are territorial, and defend their turf from other titi groups.