What is a Gular Sac?
A Gular Sac is the throat pouch on some birds.
A Gular Sac is a featherless pouch, or bag, or sac, that is formed by the skin from the lower beak to the neck.
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Siamang
The Siamang (Symphalangus syndactylus) is an arboreal gibbon, native to Indonesia, Malaysia, and Thailand.
The Siamang has long, black, shaggy fur. Its face is hairless, except for a thin moustache. It has very long arms. Syndactylus means ‘united finger’ because the first two digits on each foot are partially joined by a piece of skin. It has a large gular sac, which is a throat pouch. The throat pouch inflates to a large balloon-shape, enabling it to make loud vocal sounds.
It can grow to 90 centimetres (36 inches) tall, which is twice the size of other gibbons, making it the largest of all gibbons.