They have dark eyes, small nostrils, and jet-black skin. Their feet have five toes, including an opposable big toe. Siamangs can grasp and carry things with both their hands and their feet. Unlike other gibbons, siamangs have webbing between the 2nd and 3rd toes. SIZE Male siamangs are slightly larger than the females.
Siamangs are the biggest type of gibbon and are the largest of the lesser apes.
They also eat insects, spiders, bird eggs, and small birds. Siamangs, like other gibbons, drink water. Often they drink by dipping a furry hand into the water or rubbing a hand on wet leaves, and then slurping up the water from their fur. Both males and females have a throat sac. The inflatable throat sac makes the siamangs the loudest of all the gibbons.