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Siamang's are the largest of the lesser-apes, and twice the size of other gibbons. Thanks to their large throat sac (called a gular sac), their call can carry for more than 2 kilometers and is frequently heard while walking in the forests of the Kerinci Seblat National Park. Usually their singing starts around 8:30 or 9:00 in the morning and can last until midday.
Seen at the foot of Sumatra's Mt. Kerinci, the highest volcano in SE Asia, in the Kerinci Seblat National Park.
Check out this amazing youtube clip to get a real appreciation for the Siamang's call: http://www.youtube.com/watch?v=DZbKgmQuy...