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Siamangs are arboreal inhabitants of the Malay Peninsula and Sumatran rain and monsoon forests. Their distinguishing feature is a large throat sac that they use to make socially important vocalizations. These primates are endangered due to illegal pet trade and habitat loss. Physical Description Males, females and infants have long, shaggy black coats with pale hairs around the mouth and chin. Males have a longish tuft of hair in the genital region. Siamangs have a grayish or pinkish throat sac, which they inflate during vocalizations. The throat sac can become as large as a grapefruit. Their arms are longer than the legs of the white-cheeked gibbon, and their hands and feet are broader. The arm length may reach two and a half times the length of the body. The primates have slight webbing between their second and third toes. Both sexes have long canine teeth, opposable thumbs and a great toe that is deeply separated from the other toes. Like other primates, siamangs have a highly developed brain. When on the ground, siamangs are usually bipedal, moving on their two legs. In the trees, they move by acrobatic hand-over-hand swinging through the branches, a process called brachiating. When moving slowly, they swing much like a pendulum as they grab one branch and release it before grabbing the next, so that the body is freely projected through the air. Flights of 25 to 32 feet (8 to 10 meters) have been witnessed. The heavier and larger siamangs, however, travel more slowly than the white-cheeked gibbons. Size Siamangs are slightly larger than other gibbons at 29 to 35 inches (74 to 89 centimeters) tall and weighing about 23 pounds (10 kilograms). Native Habitat Siamangs live in the mountains of the Malay Peninsula and Sumatra in rainforests and monsoon forests. They have relatively small ranges, about 60 acres (0.24 square kilometers). They seem to travel about half as much daily, which may be because they consume a greater percentage of a more common food, leaves. They defend about 60 percent of their range as group territory. It is harder to determine boundaries for siamang groups as their loud calls seem to create more space between groups and confrontations are very rare. Siamangs are arboreal. Communication Vocalization is a major social investment. Males and females call together, even during the female great call. When vocalizing, the siamang can produce two different kinds of notes using its throat sac: a deep boom (when it sings into the sac with its mouth closed) and a loud "wow" (when it sings into the sac with its mouth opened). The deep boom sound carries farther in the forests than the high-pitched wow sound. Siamang also make a bark-like vocalization. The set calls are repeated one after another. They start off slowly and increase in speed. Calls are often accompanied by behavioral acrobatics. siamang siamang gibbon siamang gibbons siamang monkey siamang ape siamang call baby siamang siamang baby upin & ipin keris siamang tunggal siamang sounds siamang sound upin ipin keris siamang tunggal siamang gibbon call upin ipin keris siamang tunggal full movie download upin ipin keris siamang tunggal full movie lk21 siamang locomotion siamang skull siamang pronunciation what is a siamang siamang monkey call siamang habitat siamang diet download film upin ipin keris siamang tunggal siamang facts siamang adaptations keris siamang tunggal