Facts about Siamangs
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Classified as Symphalangus syndactylus, siamangs are the largest of all gibbon species and belong to the family Hylobatidae.
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Siamangs inhabit the tropical rainforests of Malaysia and Thailand, occupying a range spanning approximately 23,000 square kilometers across the Malay Peninsula and southern Thailand.
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Infant siamangs cling to their mother's fur for approximately two years before becoming sufficiently independent to travel through the canopy on their own.
- 07
Flexible throat sacs in siamangs allow them to produce loud calls while hanging upside down from branches, a unique adaptation among all ape species.
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Siamangs consume primarily ripe fruits, with figs comprising up to 60 percent of their diet across the year in Malaysian and Thai rainforests.
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The throat pouch of a male siamang can inflate to the size of a grapefruit during vocalizations, amplifying sound production for territorial communication.
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At 7 to 13 kilograms, siamangs weigh significantly less than other apes, with females typically 10-20 percent lighter than males of the same species.
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Siamangs are the only apes that form monogamous pair bonds, with couples remaining together for life and jointly raising offspring over approximately 13 years.
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During their duet calls, paired siamangs produce synchronized vocalizations reaching 90 decibels that can travel up to half a mile through rainforest canopy.
- 01
Reaching up to 26 inches in arm span relative to their body size, siamangs possess the longest arms of any ape species.