They forage for food in the forests during the day, eating fruit (which constitutes about 75% of their diet), leaves, flowers, seeds, tree bark, and tender plant shoots. Males assist with parental care by helping to defend their young and defending the territory, and sometimes they will groom, play with, or carry their young. Stephens, M.E., and J.D. Baltimore: Johns Hopkins University Press,1991. 2nd ed. . Copyright © 2020 Multiply Media, LLC. Siamangs occur in lowland, hill, and upper regions of dipterocarp forest, spending most of their time within the mid-upper canopy. San Diego: Academic Press, 1988. . Siamangs, like other gibbons, drink water. Logging, road development, hydroelectric schemes and conversion to agriculture, are destroying the siamang's habitat. They can move swiftly and gracefully through the tree-tops by swinging hand over hand from Wilson, D.E., and D. Reeder. Siamangs are somewhat less agile than the true gibbons. The true gibbons are five species in the genus Hylobates, while the siamangs are two larger species of Symphalangus. The Siamang lives in Sumatra, Peninsular Malaysia, as well as a small area in southern Peninsular Thailand. Distribution, Abundance, and Conservation. . Infants are entirely black. . They can be heard through the forest up to 3.2 km distant. Gibbons are extremely agile, and are sometimes referred to as the most acrobatic of all the mammals. Infants are entirely black. In fact, the arms of gibbons are long enough to easily touch the ground as these animals walk. Siamang gibbons have shaggy black fur, except for a gray area around their chin and mouth. • … Smuts, B.B., D.L. All Rights Reserved . The hoolock gibbon (Hylobates hoolock) occurs in Southeast Asia. Primate Adaptation and Evolution. . —A breeding system in which a mature male and a mature female live as a faithful, mated pair. They sometimes grow to double in size compared to other gibbons. Washington, DC: Smithsonian Institution Press, 1993. A Siamang defends its territory with a singing ritual that starts at about 9 am each day and lasts for about an hour. Siamangs occur in montane and sub-montane forests between about 2,000-6,400 ft (600-2,800 m) in elevation. This can range from lowland forest around sea level, to montane forest at an altitude as great as 7,900 ft (2,400 m). . 2. Fleagle, J.G. Some species of gibbons, especially the siamangs, are endangered by extensive losses of their natural habitat of tropical forests. These flying leaps, sometimes assisted using elastic branches, can cover a distance as great as 40 ft (12 m).

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