Cebus nigritus

Geographic Range

Cebus nigritus , otherwise known as the black capuchin, is found in the Atlantic rainforest of southeastern South America. The black-horned capuchin can be found as far north as 15 degrees south latitude and as far south as 30 degrees south latitude. These geographic limits equate to as far north as southern Brazil and as far south of the tip of northern Argentina. The east-west bounds are as far as the east coast (45 degrees west longitude) to 60 degrees west longitude.

• Biogeographic Regions
• neotropical neotropical
  • native native

Habitat

The black-horned capuchin lives in the rainforests of South America. Cebus nigritus has been found to live in the middle canopy and below the canopy in forests ranging in elevation from 300 to 1000 m above sea level. As the capuchin depends on the presence of bromeliads, which are epiphytes that grow on mature trees, to navigate from tree to tree.

• Habitat Regions
• tropical tropical
• terrestrial terrestrial

• Terrestrial Biomes
• forest forest
• rainforest rainforest

Physical Description

The black-horned capuchin is so named because of two distinct patches of black fur on the top of the head. The fur on its back is a mix between black and dark brown, while their belly is a shade lighter. On the face, this species has white fur around its cheeks with black fur on the lateral sides of the face. Cebus nigritus , like all species of the capuchin, has a prehensile tail for grasping onto branches and limbs and navigating throughout the forest. The average weight of the black-horned capuchin ranges between 2.0-3.3 kg. The head and body length averages from about 32-55 cm, while the average length of the tail is 35-50cm. Males tend to range in length from around 45-55cm because of larger heads and bodies compared to the females., Juveniles do not look different from adults in terms of coat color, except for growth in size and weight; the fur will remain the same colors.

• Other Physical Features
• endothermic endothermic
• bilateral symmetry bilateral symmetry

• Sexual Dimorphism
• male larger

Reproduction

The mating system of Cebus nigritus is solely initiated by the female but is decided by the alpha male. Once the female finds her target, for a few days the female will follow the male around. She will show interest by using facial expressions such as long smiles and eyebrow maneuvers attempting to gain the alpha male’s attention. She then will begin engaging physically with him by touching him, with a poke or a prod, and then abruptly running away, encouraging him to chase her. The female will often vocalize her interest by purring for hours in the general direction of her alpha male. After a few days have passed and the alpha male has noticed her interest, he will gain interest, claiming his female and initiating mating. The alpha male will mate with many different females throughout his lifetime to ensure to spread his offspring survive.

• Mating System
• polygynandrous (promiscuous) polygynandrous (promiscuous)

The black-horned capuchin can mate year-round but is generally confined to early December until late April. The female’s pregnancy lasts for an average of 150 days, and will most likely be only one offspring. Females will wait at least 2 years until they breed again. When the offspring is born, the mother will take complete care of it until it is independent. Sexual maturity and independence is reached around four years for females and eight years for males. A newborn capuchin averages1.15 kg and is usually ceases growing by its third year.

• Key Reproductive Features
• seasonal breeding seasonal breeding
• gonochoric/gonochoristic/dioecious (sexes separate)
• sexual sexual
• viviparous viviparous

For Cebus nigritus newborns, the mother will nurture the baby while the father protects the territory and hunts for food. The mother will carry the newborn on her chest for the first year of its life for protection and nurturing. After about a year, the mother will move the juvenile to her back, where the juvenile will latch itself to her back. When the infant reaches maturity at 4-8 years, it leaves its mother and becomes independent.

• Parental Investment
• altricial altricial
• female parental care female parental care
• pre-weaning/fledging
  • provisioning
    • female
  • protecting
    • female
• pre-independence
  • provisioning
    • female
  • protecting
    • female
• maternal position in the dominance hierarchy affects status of young

Lifespan/Longevity

In captivity the average lifespan of the black-horned capuchin ranges from 40 to 50 years. In the wild, the average lifespan is around 30 years.

Behavior

Cebus nigritus tends to travel in packs, or troops, ranging from 5 to 25 (average = 15). This species swings and climbs from tree to tree to navigate throughout the habitat. Once the young male reaches its maturity around age 8, it will leave its troop and search for a mate. This will result in the female members of the group staying the same while different males will come and go. Each troop has an alpha male who provides protection for his troop. Because home ranges overlap, on average, by 35%, different troops have been observed foraging close to one another. The alpha males will confront the enemies with vocal screams, throwing rocks, and even fighting to try to scare the other group away. The alpha male is not just a warrior, but he is the leader of the troop. He decides where to forage, who is allowed to join their troop and who eats first. Social grooming is something that holds equality amongst the groups; this cleans, heals, and bonds the species. The capuchin species in general is a very mischievous species and the worst antagonists. Females mate with the alpha male as a sense of strength and survival. With a polygynandrous system, females breed every two years. While the mother is the primary caretaker, the father focuses solely on leading the group.

• Key Behaviors
• arboreal arboreal
• scansorial
• terricolous
• diurnal diurnal
• motile motile
• sedentary sedentary
• territorial territorial
• social social
• dominance hierarchies dominance hierarchies

Home Range

The home range is effected by the availability of food and mates with the average of 80 ha to 150 ha.

Communication and Perception

This capuchin species is known to have an extensive personality with a variety of facial expressions, which are used to communicate. It is also capable of grooming itself and others strengthening the bond between the two animals. For instance, a mother will groom its child as a form of nurturing. When foraging, this species will scream, whistle, and bark to communicate with its troop. Black-horned capuchins are color-blind, but this allows them to overcome the difficulty of finding camouflaged insects and other defensive tactics used by prey such as mimicry. Males will mark their own fur with urine, a signal to the females that the males are ready to mate. The female capuchins vocalize interest when ready to mate. Males will then begin screaming to show dominance and claim its companion.

• Communication Channels
• visual visual
• tactile tactile
• acoustic acoustic
• chemical chemical

• Other Communication Modes
• scent marks scent marks

• Perception Channels
• visual visual
• tactile tactile
• acoustic acoustic
• chemical chemical

Food Habits

The black-horned capuchin is an omnivore with a main part of its diet including mostly fruits such as berries, seeds, and even leaves. This species has the ability to use tools and hands in order to peel fruits and to access shelled protected nuts. When both fruits and nuts are unavailable, Cebus nigritus also eats young frogs or birds, insects, and even the eggs of birds and amphibians. For example, treefrogs in Family Hylidae are commonly preyed on by the black-horned capuchin. AUTHORS (year) report the diet of the black-horned capuchin consists of about 50 to 75% fruits and nuts, 25 to 35% animals, and 7% other plants and shrubs.. Foraging for food is an all-day activity, occupying 70% of the day, from sunrise to late evening. This duty can be a loud and disturbing process between cracking nuts open and calling others for help, attracting other monkeys and even other predators such as jaguars, << Panthera onca>>, and hawks, << Harpia harpyja>>. Because of this, this species will seek food in groups known as troops, to provide protection while also covering more ground through the trees, raiding nests, and turning over rocks to find potential food.

• Primary Diet
• omnivore omnivore

• Animal Foods
• birds
• mammals
• amphibians
• eggs
• insects

• Plant Foods
• leaves
• wood, bark, or stems
• seeds, grains, and nuts
• fruit
• flowers

Predation

Cebus nigritus is very alert and aware of its surroundings and will look out for members of its troop. When a predator is spotted such as jaguars ( Panthera onca ), harpy eagles ( Harpia harpyja ), cougars ( Puma concolor ), jaguarundis ( Puma yagouaroundi ), coyotes ( Canis latrans ), tayras ( Eira barbara ), pythons ( Pythonidae ), anacondas ( Eunectes murinus ), American crocodiles ( Crocodylus acutus ). The alpha male will vocalize with a whistling sound to alert his troop. This whistling tells the troop to run and take cover, while assembling the other males to fight off the predator. The black-horned capuchin often makes false alarm calls when no predators are nearby.

Ecosystem Roles

Cebus nigritus is important for the ecosystem due to its dispersal of seeds throughout the rainforest. The black-horned capuchin disperses seeds when foraging for food, this in turn helps regenerate forest life.

The black-horned capuchin is also a host to many parasitic cells. The roundworm ( Microfilaria panamensis ) will attach itself within the fur of the species into order to spread offspring. Another parasite is acanthocephalan ( Prosthenorchis ) which will lodge itself in the saliva of this species, and can harm the bowels. Toxoplasma gondii , is another parasite that can cause harm to the black-horned capuchin, although the signs of infection vary in different cases from diarrhea to small blood smears.

• Ecosystem Impact
• disperses seeds

Economic Importance for Humans: Positive

The black-horned capuchin is commonly hunted and used for bush meat. This species is also kept as a pet in some households and used in public zoos for breeding and research purposes.

• Positive Impacts
• pet trade pet trade
• food food
• body parts are source of valuable material
• research and education

Economic Importance for Humans: Negative

The black-horned capuchin will raid the sugar canes and pine farms on local plantations. This results in a loss of profit for the local businesses. This species also has been known to be a carrier for rabies. If scratched, bit, or come in direct contact with the infected saliva to an open wound, the rabies will spread.

• Negative Impacts
• injures humans
  • causes disease in humans causes disease in humans
• crop pest
• causes or carries domestic animal disease causes or carries domestic animal disease

Conservation Status

Cebus nigritus is listed as “Near Threatened” according the IUCN Red List and is on Appendix ll of CITES. Appendix II grants access to trade the species but maintains the amount. If needed, the Appendix II gives permission to trade look alike species, in order for protection.

A major contributing threat is hunting and poaching. Humans track and kill these animals for money, trophies, and fur and bush meat. Besides hunting, there is deforestation, which removes suitable habitat from the capuchins’ geographic range. There are a number of protected areas of the rainforest that prohibit any hunting, poaching, or deforestation. The largest protected park is Iguazu National Park, which is located in Argentina and Brazil. This could probably be better developed, especially if a species is near threatened – look around for more info about conservation measures

Additional Links

Encyclopedia of Life

Contributors

Nate Welch (author), Radford University, Cari Mcgregor (editor), Radford University, Zeb Pike (editor), Radford University, Karen Powers (editor), Radford University, April Tingle (editor), Radford University, Jacob Vaught (editor), Radford University, Tanya Dewey (editor), University of Michigan-Ann Arbor.

References

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