Red titi monkeys (Callicebus cupreus) are South American primates found in Brazil, Bolivia, Peru, Ecuador, and Colombia. There are three subspecies of red titi monkeys found in riparian habitats. In Brazil, they can be found west of the Rio Madeira, and populations continue west into Peru near the Rio Huallaga. They can also be found in the upper Rio Madre de Dios basin in Bolivia and Peru, near the northern Rio-Maranon-Amazonas area, and around the Eastern Cordillera in Peru and Ecuador. In Colombia, red titi monkeys inhabit the region between the Rios Guamues and the Putumayo. There is a 350 km gap spanning the area between the Putumayo and the Upper Rio Orinoco basin where no red titi monkeys can be found. Populations are also found along the eastern base of the Sierra de la Macarena between the Guyabero and Upia rivers.

Biogeographic Regions: neotropical (Native )

Red titi monkeys are small New World monkeys, with both males and females weighing around 1 kg. The length of their head and body together ranges from 287 to 390 mm, they also have a tail that is about one third to one fourth the length of the head and body combined. The tail is not prehensile, but may play a role in male-female bonding, as mates have been seen sitting with tails intertwined. Red titi monkeys have a dental formula of 2/2, 1/1, 3/3, 3/3. Males and females have canines which are similar in size and length. The molars of Callicebus species are morphologically simple.

Red titi monkeys have coarse fur covering most of the body, except for the face. They have a band of white fur across the crown of the head and red colored fur running along the sides of the cheeks, chest, and belly. The back is covered in darker brown fur while the inner arms and legs are orange or red. The hind limbs are shorter than the forelimbs. The three subspecies of Callicebus cupreus: C. c. cupreus, C. c. ornatuas, and C. c. discolor, can be distinguished from one another based on differences in the color of fur across the forehead. Callicebus c. discolor has white or buffy colored fur running across the forehead, while C. c. cupreus has a less contrasting buffy colored forehead with an outline of black fur. Callicebus c. ornatus shares the pale colored forehead with C. c. discolor, but can be distinguished by the pale fur on its digits.

Average mass: 1 kg.

Other Physical Features: endothermic ; homoiothermic; bilateral symmetry

Sexual Dimorphism: sexes alike

Average mass: 1120 g.

• Terrestrial

Red titi monkeys are found most often in lowland tropical and sub-tropical forests which flood seasonally. They also favor forest understory habitats, young forests, swamp edges, and bamboo thickets.

Habitat Regions: tropical ; terrestrial

Terrestrial Biomes: forest ; rainforest

Other Habitat Features: riparian

Red titi monkeys spend approximately 75% of their feeding time eating fruit. The other 25% of the time they consume leaves, bamboo shoots, and some insects. The two fruits most often consumed are Ficus and Brosimum rubecens, which are both soft fruits. Berries are also commonly eaten. Peak feeding times are in the morning and later afternoon, with additional feeding on leaves prior to sleeping. Red titi monkeys are rarely seen feeding in the same trees at the same time as other primates, but can be seen feeding in a tree before or after another primate species. Individuals of a family group habitually feed on the same food source at the same time, indicating a possible social aspect to feeding times. Females have been found to double their intake of insects when lactating, a period during which the protein needs of females increases. Conversely, males have not been seen to make any changes to their diets during the period where they carry infants on their backs.

Animal Foods: insects

Plant Foods: fruit

Primary Diet: herbivore (Frugivore )

Red titi monkeys are important in their habitat as prey for diurnal raptors and, sometimes, Cebus monkeys. They also compete for food resources for other neotropical primates. Finally, they may disperse the seeds of the fruits they eat.

Ecosystem Impact: disperses seeds

Predators that may prey on red titi monkeys include diurnal birds of prey, cats, and possibly capuchin monkeys (Cebus). Red titi monkeys are not a main source of food for local hunters, compared to larger neotropical primates, making human predation threats rare.

Known Predators:

• capuchin monkeys (Cebus)
• diurnal birds of prey (Accipitridae)
• feral cats (Felis silvestris)

Red titi monkeys have a strong sense of smell, which plays a role in communication through olfaction. When two red titi monkeys encounter one another for the first time they sniff the face of their new acquaintance. Males also sniff the genital region of their mate before copulating as well as at other times. They also engage in chest rubbing. Male red titi monkeys rub their chests across horizontal branches, spreading secretions from their sternal gland, and have been observed sniffing the branch following chest rubbing. This may play a role in marking territory, but individuals have only been observed sniffing their own scent and not those of others.  Grooming and tail intertwining are forms of communication that involve all members of the group, and are important in forming social bonds. Members of a family group will engage in tail intertwining at the end of the night before sleeping. Red titi monkeys have several visual cues that they display when excited or angry. Angry individuals may engage in body swaying, looking away, shaking of the head and body, or raising and lashing of the tail. Other visual cues include a lowered head, closed eyes, protruding lips, bared teeth, an arched back, and pilo-erection.

Red titi monkeys are highly vocal animals and have a complex system of vocalizations. Vocal elements include whistles, screams, grunts, and moans. The most frequently used vocalizations are bellows, pumping, and panting, which are the main components of male and female pair duets. Duets are performed daily at or before sunrise and are usually performed near the border of the home range. Neighboring pairs respond to duetting, which is important in defining territorial boundaries between family groups. A duet can last up to five minutes, with males and females sitting half a meter from one another. A duet begins with moaning and ends with honking. Following moaning, males will typically bellow and females will pant during the bellows, then both will engage in pumping as a synchronized transition, followed by females bellowing while males pant.  There are no sex-specific song components, as both males and females alternate between bellows and pants. The duet is only synchronized during the transition between sequences, and neither mate has been found to adapt their pitch or frequency to match their counterpart. The synchrony and sequence in which a pair performs their duet develops slowly over time. A new pair will begin duetting within the first day of becoming mates, but new pairs show greater variability in the length of sequences in their duets than do established pairs. Interestingly, weather seems to have an impact on the frequency of duetting, as it has been observed that pairs engage in more calls on overcast days than clear days and do not make calls during rain. Unpaired, non-resident males also communicate with one another through vocalizations; these calls are different from male portions of duetting.

Communication Channels: visual ; tactile ; acoustic ; chemical

Other Communication Modes: duets

Perception Channels: visual ; acoustic

There is little information available on the lifespan of Callicebus cupreus. A related species, Callicebus moloch, has a life span of 25 years.

Average lifespan

Status: captivity: 26.4 years.

Titi monkeys (Callicebus) in general are monogamous, and red titi monkeys are no exception. Monogamous pairs mate for many years and can have up to three generations of offspring living in the family group at any time.

Mating System: monogamous

Red titi monkeys give birth once a year to a single young between November and March. They have an estrus cycle of 17 to 21 days. Family groups range in size from two to five members, including the mated pair and one to three young.

Breeding interval: Red titi monkeys give birth once yearly.

Breeding season: Red titi monkeys have one birth per year between November and March.

Average number of offspring: 1.

Average weaning age: 4 months.

Average time to independence: 2 years.

Key Reproductive Features: iteroparous ; seasonal breeding ; gonochoric/gonochoristic/dioecious (sexes separate); viviparous

Average birth mass: 74 g.

Average gestation period: 132 days.

Average number of offspring: 1.

Male parents are the main caregivers: they carry the young on their backs, beginning within hours of birth, and continue to do so at all times, except when the mother is nursing the infant. Males continue to carry the young until they reach 4 months old.

Parental Investment: altricial ; pre-fertilization (Provisioning, Protecting: Female); pre-hatching/birth (Provisioning: Female, Protecting: Female); pre-weaning/fledging (Provisioning: Female, Protecting: Male); pre-independence (Provisioning: Male, Protecting: Male)

Red titi monkeys are listed by the IUCN as a species of least concern.

US Federal List: no special status

CITES: no special status

IUCN Red List of Threatened Species: least concern

There are no negative impacts of red titi monkeys on humans.

Red titi monkeys attract ecotourism ventures.

Positive Impacts: ecotourism