The genus Hylobates, commonly called the lar gibbons, range from China in the north through Thailand, southern Myanmar, eastern Cambodia, the Malay peninsula and the islands on the Sunda Shelf, including Sumatra, the Mentawai Islands, Java, and Borneo. offspring are produced in more than one group (litters, clutches, etc.) sexual dimorphism), seasonal changes (e.g. 2008. Reichard, U., V. Sommer. They have comically long arms and adapted shoulder joints to help them swing gracefully through the forest. 2004). Referring to a mating system in which a female mates with several males during one breeding season (compare polygynous). Cambridge, UK: Cambridge University Press. rainforests, both temperate and tropical, are dominated by trees often forming a closed canopy with little light reaching the ground. Home ranges are defended during intergroup encounters and overlapping zones of ranges. Gibbons range in color from light sandy blonde to dark brown. American Journal of Primatology, 46: 35-62. Vocal and physical interactions when retreating to sleeping trees are absent so as to avoid predator detection. On average, 15.5 hours are spent up in 'sleeping trees', from a few hours before dusk comes, until the following morning, a behavior which is an adaptation to minimize risk of predation. Mating patterns and sexual swellings in pair-living and multimale groups of wild white-handed gibbons, Hylobates lar. The lar gibbon spends most of its life above the ground. Home ranges are anywhere from 17 to 40 hectares in size (Savini, Boesch and Reichard, 2009).  They are found in Indonesia, Laos, Malaysia, Myanmar and Thailand. While ADW staff and contributors provide references to books and websites that we believe are reputable, we cannot necessarily endorse the contents of references beyond our control. cm. A natural epizootic in a laboratory colony. Order: Primates . Gray, S. 2012. Mariah Beaman (author), Northern Michigan University, John Bruggink (editor), Northern Michigan University, Tanya Dewey (editor), University of Michigan-Ann Arbor. The White-handed Gibbon (Hylobates lar) [also known as the Lar Gibbon] is a widespread species found in lowland and hill evergreen forests in Malaysia, Thailand, Myanmar, Laos, China as well as in northern Sumatra. Duets occur between sunrise and noon, and peak at mid-morning. They are usually active for an average of 8.5 hours during the day, spend their days feeding (32.6%), resting (26.2%), traveling (24.2%), in social activities (11.3%), vocalizing (4.0%) and in intergroup encounters (1.9%), although actual proportions of activities can change significantly over the course of the year. Lar gibbons do not have tails. Lar gibbons have the greatest north-south range of any of the gibbon species. Normal duets are loud songs delivered by a mated pair that is made up of an introductory call, a great call, and an interlude sequence. The ADW Team gratefully acknowledges their support. (Gron, 2010), Habitats in which white-handed gibbons are found include dipteropcarp forests, lowland and submontane rainforests, mixed deciduous bamboo forests, seasonal evergreen forests, and peat swamp forests (Gron, 2010). Their range historically extended from southwest China to Thailand and Burma south to the whole Malay Peninsula in primary and secondary tropical rain forests. Gibbons belong to the group of lesser apes. animals that use metabolically generated heat to regulate body temperature independently of ambient temperature. 1969. Of all the gibbon species, white-handed gibbons inhabit the greatest north-south range. Adult size is gained at 6 years but offspring remain in their natal group until around 9 years old, when they reach sexual maturity. It is also present in the northwest portion of the island of Sumatra. "Lar gibbon Hylobates lar" They also eat flowers, leafy plants, and insects. According to the IUCN Red List no population estimates are currently available for Indonesia, Malaysia, and Myanmar. The Animal Diversity Web is an educational resource written largely by and for college students. Males are 43.5 to 58.4 cm long and females are 42.0 to 58.0 cm long. The mother provides most of the parental care but the father and older siblings help to raise the young. Weaning lasts about 20 months. the family Hylobatidae consists of 4 genera and 13 species of gibbons, including the Lar Gibbon and the Siamang, collectively known as the lesser apes. Barelli, C., M. Heistermann, C. Boesch, U. Reichard. 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