The Brown Titi Monkey is a New World primate who lives in the northern Amazon rainforest of Colombia to Brazil and Peru. They have a head and body length of 23-46 centimetres and a tail which is longer than the head and body. The tail is always furry and is not prehensile. Diurnal and arboreal, titis predominantly prefer dense forests near water. They easily jump from branch to branch, earning them their German name, Springaffen (jumping monkeys). They sleep at night, but also take a midday nap. Titis are territorial. They live in family groups that consist of parents and their offspring, about two to seven animals in total. They defend their territory by shouting and chasing off intruders, but rarely engage in actual fighting. Their grooming and communication is important for the co-operation of the group. They can typically be seen in pairs sitting or sleeping with tails entwined. They eat mainly fruits, although they also eat leaves, flowers, insects, bird eggs and small vertebrates. Titis are monogamous, mating for life and the female bears a single young after about a five-month gestation. Twins occur rarely, having been documented in only 1.4% of all births. While the second infant usually does not survive, cases where neighbouring groups have adopted infants are known, suggesting that twins may be reared successfully under certain circumstances. Often it is the father who cares for the young, carrying it and bringing it to the mother only for nursing.