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Lifespan, longevity, and ageing

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Observations: Little is known about the longevity of these animals. There are no records of animals living more than 8 years in captivity (Richard Weigl 2005). It has been estimated that they live up to 20 years (http://pin.primate.wisc.edu/), which is possible but unconfirmed.
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Benefits

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Mexican black howler monkeys occasionally raid crops, although this behavior is rare (Estrada, 2006).

Negative Impacts: crop pest

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Lau, K. 2007. "Alouatta pigra" (On-line), Animal Diversity Web. Accessed April 27, 2013 at http://animaldiversity.ummz.umich.edu/site/accounts/information/Alouatta_pigra.html
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Kimberly Lau, Yale University
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Eric Sargis, Yale University
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Tanya Dewey, Animal Diversity Web
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Associations

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Mexican black howler monkeys can howl to frighten away predators or alert others of a predator's presence. Mothers aggressively protect their young for a year against predators and other dangers (Kitchen, Horwich, & James, 2004). The greatest predatory threat to young black howlers is infanticide by adult males. Otherwise, there are few natural predators for Mexican black howler monkeys. Occasionally they are preyed upon by jaguars, pumas, and harpy eagles (Knopff & Pavelka, 2006). Other cats, large birds of prey, and large arboreal snakes are also potential predators (Treves, Drescher, & Snowdon, 2003). Humans have been known to illegally catch individuals for pets, and they are occasionally eaten by humans (Kitchen, Horwich, & James, 2004).

Known Predators:

  • jaguars (Panthera onca)
  • pumas (Puma concolor)
  • harpy eagles (Harpia harpyja)
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Lau, K. 2007. "Alouatta pigra" (On-line), Animal Diversity Web. Accessed April 27, 2013 at http://animaldiversity.ummz.umich.edu/site/accounts/information/Alouatta_pigra.html
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Kimberly Lau, Yale University
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Eric Sargis, Yale University
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Tanya Dewey, Animal Diversity Web
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Morphology

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Alouatta pigra is one of the largest monkeys in the Americas. It averages 70 cm long, excluding the tail, which is slightly longer than its body length ("Belize Zoo", 2007). It is the largest and most sexually dimorphic of the howler monkeys, with an average weight of 11.4 kg for males and 6.4 kg for females (Fleagle, 1999). They are characteristically covered by black hair, which is a bit longer near the throat, and they have white genitalia (Treves, Drescher, & Snowdon, 2003). Males have a pink scrotum, which distinguishes Alouatta pigra from Alouatta palliata (Horwich, 1983a). Young retain pale fur until 9 to 10 weeks of age (Treves, Drescher, & Snowdon, 2003). Like other members of Atelidae, A. pigra has a prehensile tail with gripping pads (Fleagle, 1999).

Average mass: 6.4 - 11.4 kg.

Average length: 70 cm.

Other Physical Features: endothermic ; homoiothermic; bilateral symmetry

Sexual Dimorphism: male larger

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Lau, K. 2007. "Alouatta pigra" (On-line), Animal Diversity Web. Accessed April 27, 2013 at http://animaldiversity.ummz.umich.edu/site/accounts/information/Alouatta_pigra.html
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Kimberly Lau, Yale University
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Eric Sargis, Yale University
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Life Expectancy

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The average lifespan of Mexican black howler monkeys is 20 years ("Primate Info Net", 2004).

Average lifespan
Status: wild:
20 years.

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Lau, K. 2007. "Alouatta pigra" (On-line), Animal Diversity Web. Accessed April 27, 2013 at http://animaldiversity.ummz.umich.edu/site/accounts/information/Alouatta_pigra.html
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Kimberly Lau, Yale University
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Habitat

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The habitat of Alouatta pigra is varied, but is typically tropical forests. They are known from lowland, deciduous, semi-deciduous forests, and evergreen forests (Belize Zoo, 2007; Gonzalez-Kirchner, 1998). They are known from pristine tropical rainforest to riverine forests, and can be normally found at low elevations in riparian forests of less than 400 m, although black howlers have been found at elevations higher than 500 m (Estrada et al., 2004). In riverine habitats they usually avoid riverbank areas and inhabit inland areas (Estrada et al., 2004). They prefer larger trees and usually inhabit the middle to upper canopy (Gonzalez-Kirchner, 1998). Although they have a wide habitat range, A. pigra has lower rates of success in areas disturbed by humans (Gonzalez-Kirchner, 1998).

Average elevation: 400 m.

Habitat Regions: tropical ; terrestrial

Terrestrial Biomes: rainforest

Other Habitat Features: riparian

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Lau, K. 2007. "Alouatta pigra" (On-line), Animal Diversity Web. Accessed April 27, 2013 at http://animaldiversity.ummz.umich.edu/site/accounts/information/Alouatta_pigra.html
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Kimberly Lau, Yale University
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Tanya Dewey, Animal Diversity Web
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Distribution

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Alouatta pigra is found in Belize, northern Guatemala, and southeastern Mexico ("Belize Zoo", 2007; Gonzalez-Kirchner, 1998). They are endemic to the largest tropical rain forest region of Mesoamerica, Selva Maya, which encompasses over 4 million hectares of land in these three countries (Estrada et al., 2004). They are the only howler monkey species on the Yucatan peninsula, and are found in a reduced area of the Yucatan (Estrada et al., 2004; Gonzalez-Kirchner, 1998). They inhabit the Mexican states of Campeche, Quintana Roo, and Chiapas (Estrada et al., 2004). Populations have been found and heavily studied at the Mayan sites of Calakmul and Yaxchilán, Mexico, and Tikal National Park, Guatemala (Estrada et al., 2004). They are widespread throughout Belize.

Biogeographic Regions: neotropical (Native )

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Lau, K. 2007. "Alouatta pigra" (On-line), Animal Diversity Web. Accessed April 27, 2013 at http://animaldiversity.ummz.umich.edu/site/accounts/information/Alouatta_pigra.html
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Kimberly Lau, Yale University
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Eric Sargis, Yale University
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Tanya Dewey, Animal Diversity Web
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Trophic Strategy

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Mexican black howler monkey diet is varied. They are strict herbivores, consuming many plant parts, including flowers, fruits, and leaves ("Belize Zoo", 2007). All Alouatta species are highly folivorous. Alouatta pigra is one of the more frugivorous species in this genus. Their preferred food is fruit and they usually eat leaves only in conditions where frugivory is unfavorable (Behie & Pavelka, 2005). This allows them to have a flexible, adaptable diet that can adjust in cases of habitat change. Generally, a little more than 36% of their diet consists of fruits, followed by about 30% mature leaves, 25% new leaves and buds, and 5% flowers (Behie & Pavelka, 2005). Although they consume a significant amount of leaves, Alouatta pigra has a primitive digestive tract more suitable for frugivory; breaking down leaves therefore requires a longer digestion time, which explains the long inactive periods in their activity budget (Kitchen, Horwich, & James, 2004).

Plant Foods: leaves; fruit; flowers

Primary Diet: herbivore (Folivore , Frugivore )

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Lau, K. 2007. "Alouatta pigra" (On-line), Animal Diversity Web. Accessed April 27, 2013 at http://animaldiversity.ummz.umich.edu/site/accounts/information/Alouatta_pigra.html
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Kimberly Lau, Yale University
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Eric Sargis, Yale University
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Tanya Dewey, Animal Diversity Web
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Associations

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Mexican black howler monkeys are often found living in close conjunction with Ateles geoffroyi and other spider monkeys (Estrada et al., 2004). They are also important for the role they play in seed dispersal (Van Bell, 2006). Their frugivorous diet has helped disperse the seeds of some rainforest plants. Although they do not shy away from human contact and their presence is quite obvious due to their howling, Mexican black howler monkeys rarely interfere with human crops.

Ecosystem Impact: disperses seeds

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Lau, K. 2007. "Alouatta pigra" (On-line), Animal Diversity Web. Accessed April 27, 2013 at http://animaldiversity.ummz.umich.edu/site/accounts/information/Alouatta_pigra.html
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Kimberly Lau, Yale University
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Eric Sargis, Yale University
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Tanya Dewey, Animal Diversity Web
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Benefits

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Mexican black howler monkeys are important members of the ecosystems in which they live. Their howling is a unique element of their Mesoamerican forests and their presence can attract ecotourism.

Positive Impacts: ecotourism

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Lau, K. 2007. "Alouatta pigra" (On-line), Animal Diversity Web. Accessed April 27, 2013 at http://animaldiversity.ummz.umich.edu/site/accounts/information/Alouatta_pigra.html
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Kimberly Lau, Yale University
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Eric Sargis, Yale University
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Tanya Dewey, Animal Diversity Web
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Conservation Status

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Mexican black howler monkeys are endangered by hunting and habitat destruction. The forests in which they live and feed are often converted into pastures or agricultural plots. Human influence as a whole is causing significant fragmentation of A. pigra habitats (Estrada, 2006). Other factors resulting in declining populations are: disease, abnormal rainfall, human capture for pets, and natural disasters such as hurricanes (Gonzalez-Kirchner, 1998). In areas affected negatively by humans, Mexican black howler populations become smaller both in numbers and in area (Gonzalez-Kirchner, 1998). They have been listed by the IUCN as an endangered species since 2003. They were previously (as recently as 2000) considered lower risk/least concern (Cuarón et al., 2003). The U.S. Fish and Wildlife Service lists Alouatta pigra as a threatened species. In the next 30 years, the total population is predicted to decrease 74% (Cuarón et al., 2003). Primates from this region have been hunted and captured as pets, causing their populations to decline further (Estrada et al., 2004).

US Federal List: threatened

CITES: appendix i

IUCN Red List of Threatened Species: endangered

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Lau, K. 2007. "Alouatta pigra" (On-line), Animal Diversity Web. Accessed April 27, 2013 at http://animaldiversity.ummz.umich.edu/site/accounts/information/Alouatta_pigra.html
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Kimberly Lau, Yale University
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Eric Sargis, Yale University
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Tanya Dewey, Animal Diversity Web
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Behavior

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Mexican black howler monkeys announce and defend group territories through howling vocalizations ("Belize Zoo", 2007). They are highly social animals Adult howlers are less social, while infant and adolescent howlers engage in most of the social interactions (Behie & Pavelka, 2005). Adults in a group will often howl when approached by one or a few solitary males who may be trying to take over the alpha spot in the troop (Kitchen, Horwich, & James, 2004). Other threats include these solitary males trying to commit infanticide and thus lowering the reproductive success of the current alpha male (Kitchen, Horwich, & James, 2004). Howling can last for over an hour and is low frequency and loud: about 88 decibels at a 5 m distance (Kitchen, Horwich, & James, 2004). The energy used in howling is still less, and the risk smaller, than in physical confrontation. When more than one male is present howling occurs in staggered rounds and, as a result, howling can be used to indicate the number of males present (Kitchen, Horwich, & James, 2004). This information is useful to a group in deciding whether or not to approach another group and initiate a physical confrontation (Kitchen, Horwich, & James, 2004). The howls of females are aurally different from those of males, but they also participate in group howling.

Communication Channels: visual ; tactile ; acoustic ; chemical

Other Communication Modes: choruses

Perception Channels: visual ; tactile ; acoustic ; chemical

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Lau, K. 2007. "Alouatta pigra" (On-line), Animal Diversity Web. Accessed April 27, 2013 at http://animaldiversity.ummz.umich.edu/site/accounts/information/Alouatta_pigra.html
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Kimberly Lau, Yale University
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Eric Sargis, Yale University
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Tanya Dewey, Animal Diversity Web
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Untitled

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Alouatta pigra is commonly known as Mexican black howler monkeys, Guatemalan howler monkeys, and saraguatos.

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Lau, K. 2007. "Alouatta pigra" (On-line), Animal Diversity Web. Accessed April 27, 2013 at http://animaldiversity.ummz.umich.edu/site/accounts/information/Alouatta_pigra.html
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Kimberly Lau, Yale University
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Eric Sargis, Yale University
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Tanya Dewey, Animal Diversity Web
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Reproduction

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Generally, only the dominant males or other males with high social status in the troop will copulate with females. The alpha male copulates more frequently and with more females at the peak of their cycle, which lasts two to four days (Van Bell, 2006). As a result of the social standing necessary to have the privilege of mating, males often mate later in life than females (Van Bell, 2006). Females seem to have reproductive success at a younger age, and, regardless of social position, copulate multiple times per cycle (Van Bell, 2006).

Van Bell’s (2006) description of the mating behavior of Alouatta pigra begins with the male sniffing the urine of the female and licking the female genitalia to detect her stage in the estrus cycle. To demonstrate interest, both the male and the female flick their tongue in and out of their mouth. Observational studies also show that females may incite mating by grabbing the hairs on a male' face. During the mating period, the pair mutually stay together for a few days and perform multiple copulations. The male usually mounts the female, holding on to her shoulders with his hands, and sometimes will use his feet to grasp as well. Generally, copulation lasts 30 seconds to one minute (Horwich, 1983b).

Mating System: polygynous

Sexual maturity is reached at the age of four years old ("Belize Zoo", 2007). However, males from 3 to 4 months of age already have a pale pink pigmented scrotum with descended testes (Horwich, 1983a). Researchers have been unable to detect any visual indications of the female estrus cycle in Alouatta, and there has not been much research on reproductive behavior and biology in general. Most research on reproduction is based on hormones collected from fecal matter in conjunction with information about the ages of individuals from which the fecal samples were collected (Van Bell, 2006). The female estrus cycle lasts from 11 to 24 days, peak time for conception lasts 2 to 4 days (Van Bell, 2006).

Mexican black howler monkeys do not exhibit seasonality in reproduction, possibly because their diet of leaves and unripe fruits is not seasonal in availability (Crockett & Rudran, 1987). There are slightly fewer births when new leaves and fruits emerge (Van Bell, 2006). Pregnancy lasts about 180 days. Offspring of both sexes often do not stay with their original troop (Kitchen, Horwich, & James, 2004).

Breeding interval: Mexican black howler monkeys reproduce yearly.

Breeding season: Mexican black howler monkeys may breed throughout the year.

Average number of offspring: 1.

Average gestation period: 180 days.

Range age at sexual or reproductive maturity (female): 3 to 4 years.

Range age at sexual or reproductive maturity (male): 3 to 4 years.

Key Reproductive Features: iteroparous ; year-round breeding ; gonochoric/gonochoristic/dioecious (sexes separate); sexual ; viviparous

Mexican black howler monkeys have single births ("Belize Zoo", 2007). Males in this species commit infanticide, possibly with the aim of limiting the sizes of their troops (Knopff & Pavelka, 2006). Females care for their young for 12 months after birth, providing direct care and protection from predators and adult males. Parenting is an individual role, as other members of the troop normally do not help raise offspring. Mothers are rarely far away from their newborns and are watchful for dangers to their young (Treves, Drescher, & Snowdon, 2003). However, as their young grow past the neonatal and infant stage, they are accorded a much greater range of freedom.

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

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Lau, K. 2007. "Alouatta pigra" (On-line), Animal Diversity Web. Accessed April 27, 2013 at http://animaldiversity.ummz.umich.edu/site/accounts/information/Alouatta_pigra.html
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Kimberly Lau, Yale University
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Eric Sargis, Yale University
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Tanya Dewey, Animal Diversity Web
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Biology

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Guatemalan black howlers live in stable troops composed of one or two adult males, a few breeding females, and their offspring, with an average group size of between four and six individuals (2) (6). Groups of bachelor males also exist, the members of which will fight resident males for possession of their troop and access to breeding females (6). The territory of each troop ranges between 3 and 25 hectares, depending upon the size of the group (10). Single offspring are usual, born after a gestation period of 180 – 194 days (2). Leaves and fruit form the bulk of the diet, although flowers and insects may also be eaten. Like other members of its genus, the Guatemalan black howler has large salivary glands that help to break down the tannins in the leaves they eat (6). This monkey is mainly active in the morning and evening, but also remains busy throughout the day (5).
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Conservation

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The Guatemalan black howler is known to occur in six protected areas: Cockscomb Basin Wildlife Sanctuary, Guanacaste and Monkey Bay National Parks (Belize); Rio Dulce and Tikal National Parks (Guatemala); and Palenque National Park (Mexico) (2). Additionally, a community-based conservation organization in Belize called the Community Baboon Sanctuary (this species is called 'baboon' in the local Creole dialect) has protected land along the Belize River, ensuring that this howler's food trees are not destroyed to make way for pasture (10). Over 200 private landowners here in seven villages, stretching over 20 square miles, have voluntarily pledged to conserve their land for the protection of the Guatemalan black howler, many of which will consequently benefit from ecotourism. Indeed, one of the main aims of the Community Baboon Sanctuary is to help address habitat destruction by promoting sustainable tourism as an attractive alternative to destructive land management practices. At the same time, the Sanctuary conducts conservation research and educates the local community and visitors about the importance of biodiversity. Other conservation measures implemented by the Sanctuary include creative initiatives like building bridges made of rope and sticks that allow the monkeys to pass between gaps in the forest, and relocating a number of individuals to the Cockscomb Basin Wildlife Sanctuary (8). If similar efforts were made in Mexico and Guatemala, and ecotourism was promoted as a viable means of profiting from protected forest habitats, the Guatemalan black howler would perhaps have a much higher chance of long-term survival.
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Description

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Howlers are among the largest monkeys in the Americas, but this species is among the smallest of the genus (4). The Guatemalan black howler has a notably long, silky, dense coat of black fur with traces of brown on the shoulders, cheeks and back (2) (5). A slight crest exists on the crown, and males over the age of four months have a conspicuous white scrotum (2). The arms and legs are long but stout, and the tail is prehensile, lacks hair on its underside, and is used like a fifth limb to grasp branches and anchor the body (5) (6). Howlers earn their common name from the remarkably loud, rasping calls or howls that are characteristic of the genus (Alouatta), and emitted most elaborately and loudly by adult males (7) (8). These calls can be heard over several kilometres and serve a range of functions, including territorial advertisement, mate attraction and intimidation of rivals or enemies (7).
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Habitat

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Found in primary and secondary lowland tropical rainforest and semi-deciduous forest (2) (6). One survey suggested riverine and seasonally flooded areas are particularly attractive to this species (9). Although primarily arboreal, individuals living in mangrove swamps have occasionally been seen to swim from one small island to another (2).
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Range

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Found in Belize, northern Guatemala, south-eastern Mexico and possibly northern Honduras (2) (6). This species can often be observed in the vicinity of Mayan archaeological sites (2).
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Status

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Classified as Endangered (EN) on the IUCN Red List (1) and listed under Appendix I of CITES (3).
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Threats

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The Guatemalan black howler is threatened throughout most of its range from hunting and habitat destruction (10). Suitable forest habitat has rapidly been lost and fragmented through conversion to pasture and agricultural lands, and to logging operations (8). If such patterns continue, the population size of this species is projected to decline by around 74% over three generations (30 years) (1).
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Yucatán black howler

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The Yucatán black howler, or Guatemalan black howler, (Alouatta pigra) is a species of howler monkey, a type of New World monkey, from Central America. It is found in Belize, Guatemala and Mexico, in and near the Yucatán Peninsula. It lives in evergreen, semideciduous and lowland rain forests.[2][4] It is also known as the baboon in Belize, although it is not closely related to the baboons in Africa.[5]

Description

The Yucatán black howler is the largest of the howler monkey species and one of the largest of the New World monkeys. Yucatán black howler males are larger than those of any other Central American monkey species. On average, males weigh 11.4 kg (25 lb) and females weigh 6.4 kg (14 lb).[6] The body is between 521 and 639 mm (20.5 and 25.2 in) in length, excluding the tail.[7] The tail is between 590 and 690 mm (23 and 27 in) long. Adults of both sexes have long, black hair and a prehensile tail, while infants have brown fur.[7] Males over four months old have white scrotums.[4]

The Yucatán black howler shares several adaptations with other species of howler monkey that allow it to pursue a folivorous diet (mostly leaves). Its molars have high shearing crests, to help it eat the leaves.[6] The male of the species has an enlarged hyoid bone near the vocal cords.[8] This hyoid bone amplifies the male howler's calls, allowing it to locate other males without expending much energy, which is important, since leaves are a low-energy food. Howling occurs primarily at dawn and at dusk.[7]

The Yucatán black howler is diurnal and arboreal.[4] It lives in groups of generally one or two adult males, with a ratio of about 1.3 females for every male.[6][7] Groups generally have between two and 10 members, including juveniles, but groups as large as 16 members have been studied.[4][6] The home range is between 3 and 25 hectares.[7] Population density can exceed 250 monkeys per square kilometer in the Community Baboon Sanctuary in Belize.[2]

The Yucatán black howler's diet includes mostly leaves and fruit. Flowers also make up a small part of the diet. The breadnut tree can provide as much as 86% of the monkey's diet during some seasons.[6][7]

As with other howler monkey species, the majority of the Yucatán black howler's day is spent resting. Eating makes up about a quarter of the day, moving about 10% of the day, and the remainder of the day is spent in socializing and other activities.[6]

Females reach sexual maturity at four, and males reach sexual maturity between six and eight years old. Males leave their natal group upon reaching sexual maturity, but females generally remain with their natal group. They can live up to 20 years.[7]

Conservation status

The Yucatán black howler belongs to the New World monkey family Atelidae, which contains howler monkeys, spider monkeys, woolly monkeys and muriquis. It is a member of the howler monkey genus Alouatta. No subspecies are recognized.[1]

The species is considered to be endangered by the International Union for Conservation of Nature because the species population is expected to decline by up to 60% over the next 30 years. Threats to the species include habitat loss, hunting, and capture as pets.[2] In Belize, it is illegal to hunt this species. [9]

Sympatry

The Yucatán black howler is sympatric with the mantled howler along the edges of its range in Mexico and Guatemala near the Yucatan Peninsula.[2][10] A theory for how this sympatry occurred and why the Yucatán black howler has such a restricted range is the ancestors of the Yucatán black howler and the Central American squirrel monkey migrated to Central America from South America during the late Miocene or Pliocene. However, passage through the Isthmus of Panama then closed for a period due to rising sea levels, and later opened up to another wave of migration about two million years ago. These later migrants, ancestors to modern populations of white-headed capuchins, mantled howlers and Geoffroy's spider monkeys, out-competed the earlier migrants, leading to the restricted range of the Yucatán black howler (and the Central American squirrel monkey).[11]

References

  1. ^ a b Groves, C. P. (2005). Wilson, D. E.; Reeder, D. M. (eds.). Mammal Species of the World: A Taxonomic and Geographic Reference (3rd ed.). Baltimore: Johns Hopkins University Press. p. 149. ISBN 0-801-88221-4. OCLC 62265494.
  2. ^ a b c d e Cortes-Ortíz, L.; Rosales-Meda, M.; Marsh, L.K.; Mittermeier, R.A. (2020). "Alouatta pigra". IUCN Red List of Threatened Species. 2020: e.T914A17926000. doi:10.2305/IUCN.UK.2020-3.RLTS.T914A17926000.en. Retrieved 19 November 2021.
  3. ^ "Appendices | CITES". cites.org. Retrieved 2022-01-14.
  4. ^ a b c d Emmons, L. (1997). Neotropical Rainforest Mammals A Field Guide (Second ed.). Chicago, Ill.; London: Univ. of Chicago Pr. pp. 130–131. ISBN 978-0-226-20721-6.
  5. ^ Hunter, L.; Andrew, D. (2002). Watching Wildlife Central America. Footscray, Vic.: Lonely Planet Publications. p. 150. ISBN 978-1-86450-034-9.
  6. ^ a b c d e f Di Fiore, A.; Campbell, C. (2007). "The Atelines". In Campbell, C.; Fuentes, A.; MacKinnon, K.; Panger, M.; Bearder, S. (eds.). Primates in Perspective. New York: Oxford University Press. pp. 155–177. ISBN 978-0-19-517133-4.
  7. ^ a b c d e f g Rowe, N. (1996). The Pictorial Guide to the Living Primates. East Hampton, N.Y.: Pogonias Press. p. 110. ISBN 978-0-9648825-0-8.
  8. ^ Napier, J.; Napier, P. (1994). The Natural History of the Primates. The MIT Press. pp. 123–124. ISBN 978-0-262-64033-6.
  9. ^ "Wildlife Protection Act. Government of Belize" (PDF). Retrieved 28 January 2022.
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Yucatán black howler: Brief Summary

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The Yucatán black howler, or Guatemalan black howler, (Alouatta pigra) is a species of howler monkey, a type of New World monkey, from Central America. It is found in Belize, Guatemala and Mexico, in and near the Yucatán Peninsula. It lives in evergreen, semideciduous and lowland rain forests. It is also known as the baboon in Belize, although it is not closely related to the baboons in Africa.

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