In Other Animals
The walrus, some species of gibbon apes, the conus snail have a throat sac. Many amphibians will inflate their gular sac to create certain vocalizations to communicate, scare off rivals (to proclaim territory or dominance), and locating and attracting a mate by using their vocal sac to amplify their voice to be heard louder and closer. And some species of lizards may also have a gular fold (and gular scales), the Orangutan, only in males, is the only known ape to have this characteristic.
Read more about this topic: Gular Skin
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