The behavior of the coppery titis is characterized by a diurnal and entirely
arboreal nature, spending all of their day in trees. They live in family groups which consist of an adult pair and up to three generations of off-spring. The adult pairs are
monogamous and mate for life. Family members may engage in tail-intertwining before and during sleep. As their tails are not
prehensile they cannot be used as an additional grip. When first meeting, these monkeys will smell each other's faces. The titis will also smell their own scent by rubbing their chests on branches, spreading secretions from their sternal gland before sniffing them. It is possible that this plays a role when marking territory. They have several visual cues which they display when angry or excited. Most notably shaking of their heads and bodies, swaying, looking away from others, or raising and lashing out with their tail. Other cues include barred teeth, a lowered head, closed eyes, protruding lips or an arched back. There have been observations of the coppery titi monkeys using the
Psychotria leaf to self-medicate through fur rubbing. This ritual is rare and does not happen often. They do this by chewing on the plant and rubbing it on their abdomen for about five minutes. This behavior can be interpreted as self-medication since the plant is known for being used as a medical herb in traditional medicine, as well as having anti-viral and anti-bacterial properties. Females will show similar behaviors of their bonded pair to same-sex intruders to show a strong relationship. If successful, the intruder will go away, resulting in reproductive success for the monogamous bonded pair. Once there has been an offspring introduced to a couple, the activity budget of these monkeys will change. During this period, the mother will feed more and rest less, and the male will feed less and rest more. This is because the females will forage more to feed the baby, and the male would hold the baby more to protect them.
Anti-predation behavior Another observation that has been conducted is anti-predatory behavior. These monkeys have been seen to have a "mobbing behavior" towards possible predators. The mobbing behavior starts with one male starting an alarm call, this will trigger others to join and within two to three minutes there is a group alarm call that is surrounding the predator. Males are usually the ones who sing this alarm call. The monkeys move around the predator sporadically, continuing this alarm call, lashing their tails, and swaying their heads. During this phenomenon they also get
goose bumps. The reasoning behind it is believed to reduce attacks and increase the chances of the predator leaving. This "mobbing behavior" usually happens without infants involved. When there is an infant involved another coppery titi monkey will hide the infant farther away from the area, meanwhile still singing the alarm call. Out of all observations of this behaviour, the longest alarm call went over 40 minutes. ==Vocalization and communication==