Bornean white-bearded gibbon [1] | |
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Bornean white-bearded gibbon, (Hylobates albibarbis) in Tanjung Puting National Park | |
Scientific classification | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Chordata |
Class: | Mammalia |
Order: | Primates |
Suborder: | Haplorhini |
Infraorder: | Simiiformes |
Family: | Hylobatidae |
Genus: | Hylobates |
Species: | H. albibarbis |
Binomial name | |
Hylobates albibarbis Lyon, 1911 | |
Range of Bornean white-bearded gibbon (green) |
The Bornean white-bearded gibbon (Hylobates albibarbis), also known as the Bornean agile gibbon or southern gibbon, is a species of gibbon endemic to southern Borneo. It is an endangered species, due to the ongoing logging of tropical forests between the Kapuas and Barito rivers. [2] Additional issues of concern to the endangerment of white-bearded gibbons also threaten other arboreal primates. [3] [4]
The white-bearded gibbon is very similar to other gibbons in their behaviour and their frugivorous diet. The Bornean white-bearded gibbon was formerly considered a subspecies of the agile gibbon but based on recent DNA research, some now classify it as a separate species. [1] [4] [5]
The Bornean white-bearded gibbon is commonly seen with grey or dark brown fur, a black face, and white beard. Similar to other gibbons, these gibbons are a smaller ape that is tailless. They tend to live in small family groups consisting of a male, female, and their offspring. They express pair-bonding relationships and they do not make nests. Their mode of transportation is called brachiation, where they swing from branches to get around. They have been documented to swing up to 15 meters (49.2 feet) in a single leap and as fast as 55 kilometers (34 miles) per hour. Apart from other primates, all gibbons walk bipedally; holding their long arms over their heads. [6] [7]
The average life span for a white-bearded gibbon is 25 years, and it grows to anywhere from 17 to 25 inches (43 to 64 cm). Male white-bearded gibbons weigh about 6.1 to 6.9 kg (13.5 to 15.2 pounds), and females weigh 5.5 to 6.4 kg (12 to 14 pounds). Female white-bearded gibbons tend to reach sexual maturity in about 48 months. [8] [9]
The Bornean white-bearded gibbons' diet in the tropical forest tends to be frugivorous, where they depend on the abundance of fruit trees and figs; making their diet 65% fruit and 23% figs, respectively. They will occasionally supplement their diet with leaves and insects. [10] [11]
Logging and mining have created a threatening environment in Borneo for gibbons and all arboreal creatures. Since gibbons rely on dense and tall forest areas for safety and for travelling, this is a leading problem for the survival of white-bearded gibbons. Additional threats for the white-bearded gibbon include forest fires due to El Niño events [2] and climate change. [4]
Gibbons are apes in the family Hylobatidae. The family historically contained one genus, but now is split into four extant genera and 20 species. Gibbons live in subtropical and tropical rainforests from eastern Bangladesh to Northeast India to southern China and Indonesia.
Apes are a clade of Old World simians native to sub-Saharan Africa and Southeast Asia, which together with its sister group Cercopithecidae form the catarrhine clade, cladistically making them monkeys. Apes do not have tails due to a mutation of the TBXT gene. In traditional and non-scientific use, the term "ape" can include tailless primates taxonomically considered Cercopithecidae, and is thus not equivalent to the scientific taxon Hominoidea. There are two extant branches of the superfamily Hominoidea: the gibbons, or lesser apes; and the hominids, or great apes.
The siamang is an arboreal, black-furred gibbon native to the forests of Indonesia, Malaysia, and Thailand. The largest of the gibbons, the siamang can be twice the size of other gibbons, reaching 1 m (3.3 ft) in height, and weighing up to 14 kg (31 lb). It is the only species in the genus Symphalangus. Fossils of siamangs date back to the Middle Pleistocene.
The lar gibbon, also known as the white-handed gibbon, is an endangered primate in the gibbon family, Hylobatidae. It is one of the better-known gibbons and is often kept in captivity.
The agile gibbon, also known as the black-handed gibbon, is an Old World primate in the gibbon family. It is found in Indonesia on the island of Sumatra, Malaysia, and southern Thailand. The species is listed as endangered on the IUCN Red List due to habitat destruction and the pet trade.
Müller's gibbon, also known as the southern grey gibbon, is a primate in the gibbon family, Hylobatidae.
Kloss's gibbon, also known as the Mentawai gibbon, the bilou or dwarf siamang, is an endangered primate in the gibbon family, Hylobatidae. It is identifiable in that it is all black, resembling the siamang with its black fur, but is considerably smaller and lacks the siamang's distinctive throat pouch. Kloss's gibbon reaches a size 17 to 25 inches and weigh at most 13 pounds (6 kg). As is the case for all gibbons, they have long arms and no tail. Males and females are difficult to distinguish.
The Kapuas River is a river in the Indonesian part of Borneo island, at the geographic center of Maritime Southeast Asia. At 1,143 kilometers (710 mi) in length, it is the longest river in the island of Borneo and the longest river of Indonesia and one of the world's longest island rivers. It originates in the Müller mountain range at the center of the island and flows west into the South China Sea creating an extended marshy delta. The delta is located west-southwest of Pontianak, the capital of the West Kalimantan province. This Kapuas River should be distinguished from another Kapuas River, which starts on the other side of the same mountain range in central Borneo, but flows to the south, merging with the Barito River and discharging into the Java Sea.
The genus Hylobates is one of the four genera of gibbons. Its name means "forest walker", from the Greek hūlē and bates.
The black bearded saki is a species of New World monkey, native to the Amazon rainforest of South America, specifically to an area of north-eastern Brazil. It is one of five species of bearded saki. Bearded sakis are medium-sized (50 cm), mostly frugivorous primates, specialised in seed predation. The genus name Chiropotes means "hand-drinker" as they have been observed using their hands as ladles for scooping water into their mouths. This behavior is thought to be a way of maintaining and protecting their characteristic beards. The black bearded sakis habitat has undergone heavy habitat fragmentation, making the future conservation status of the species uncertain.
The Bornean orangutan is a species of orangutan endemic to the island of Borneo. Together with the Sumatran orangutan and Tapanuli orangutan, it belongs to the only genus of great apes native to Asia. Like the other great apes, orangutans are highly intelligent, displaying tool use and distinct cultural patterns in the wild. Orangutans share approximately 97% of their DNA with humans. Also called mias by the local population, the Bornean orangutan is a critically endangered species, with deforestation, palm oil plantations, and hunting posing a serious threat to its continued existence.
The western hoolock gibbon is a primate from the gibbon family, Hylobatidae. The species is found in Assam, Mizoram, and Meghalaya in India, Bangladesh, and Myanmar west of the Chindwin River.
Sabangau National Park is a national park in Central Kalimantan, a province of Indonesia in Kalimantan, the Indonesian part of the island of Borneo established in 2004. Between 1980 and 1995 the site was a massive logging concessions area. After 1995, the park became a site for illegal logging, which resulted in up to 85 percent of the 568,700-hectare total park area being destroyed. By 2012, less than 1 percent of the park's total area has been reforested and at the current rate, it will take several centuries to restore it to its pre-logged state.
The Borneo lowland rain forests is an ecoregion, within the tropical and subtropical moist broadleaf forests biome, of the large island of Borneo in Southeast Asia. It supports approximately 15,000 plant species, 380 bird species and several mammal species. The Borneo lowland rain forests is diminishing due to logging, hunting and conversion to commercial land use.
Tanjung Puting National Park is a national park in Indonesia located in the southeast part of West Kotawaringin Regency in the Indonesian province of Central Kalimantan. The nearest main town is the capital of the Regency, Pangkalan Bun. The park is famous for its orangutan conservation.
The western grey gibbon, also known as Abbot's grey gibbon, is a primate in the gibbon family, Hylobatidae. It was named after zoologist William Louis Abbott.
The eastern grey gibbon or northern grey gibbon is a primate in the gibbon family, Hylobatidae.