The Siamang Gibbon is not a monkey but an ape native to the forests of Malaysia and Sumatra. The largest of the lesser apes, the siamang can be twice the size of other gibbons.
The Siamang is distinctive for two reasons. The first is the fact that two fingers on each hand are fused together (hence the name “syndactylus”). The second is the large “gular sac”, a throat pouch which can be inflated to the size of the head, allowing siamangs to make loud resonating calls, or songs.
The call of the Siamang excels that of other gibbons because of the animal’s sound-amplifying throat sac. The female emits a series of barks alternated with booms resonated in the vocal pouch, which she blows up like a balloon. The mate’s higher scream is usually uttered at each of the two accelerations of the female, and their combined “song” rises in pitch to end with the thunderous pouch boom of the male. It is quite a display of territory and power and can be heard for a considerable distance.
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