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That the sia­mang (Sym­pha­lan­gus syn­dacty­lus), the largest of the gib­bons, is an arbo­real species is shown in this video. To make them­selves bet­ter heard they first travel to the top of the trees in their enclo­sure as they would do in their native habi­tat, the forests of Malaysia, Thai­land, and Suma­tra. The sia­mang is dis­tinc­tive for two rea­sons. The first is that two dig­its on each foot are par­tially joined by a mem­brane – hence the name “syn­dacty­lus”, from the Ancient Greek “sun” (=united) + “dak­tu­los” (=fin­ger). The sec­ond is the large gular sac (found in both males and females of the species), which is a throat pouch that can be inflated to the size of the siamang’s head, allow­ing it to make loud, res­onat­ing calls or songs. The ampli­fied call can be heard over sev­eral kilo­me­tres. The sec­ond fea­ture is clearly audi­ble in this footage, and you can see the gular sac too.

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