Dewlap Dewlap A dewlap is a longitudinal flap of skin that hangs beneath the lower jaw or neck of many vertebrates. While the term is usually used in this specific context, it can also be used to include other structures occurring in the same body area with a similar aspect, such as those caused by a double chin or the submandibular vocal sac of a frog. In a more general manner, the term refers to any pendulous mass of skin, such as a fold of loose skin on an elderly person's neck, or the wattle of a bird. Dewlaps can be
Gular skin lizard also have a gular fold and consequently, gular scales. The theropod dinosaur Pelecanimimus, which lived in the early Cretaceous Period 130 million years ago, also had a gular pouch, similar to the pelican after which it is named. The conus snail has a throat sac. Gular skin Gular skin (throat skin), in ornithology, is an area of featherless skin on birds that joins the lower mandible of the beak (or "bill") to the bird's neck. Other vertebrate taxa may have a comparable anatomical structure that is referred to as either a gular sac, throat sac, vocal sac or gular