Yes, they are loud.  They seem to revel in and enjoy their loudness.  Their throat sac inflates and the sound that comes out is unexpected and strong!  Like all gibbons, their call can be heard two miles away!  In fact, the siamang is the loudest of all gibbons.  In the morning, an adult female will begin hooting, and soon after, the rest of her group will join in. This is used to warn other siamang groups of their territory. Paired siamangs will also partake in “duets,” with the male screaming booms and the female producing barks.  Not an animal you’d want a neighbor to own.


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