Dewlap

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A Mastiff with a dewlap

A dewlap is a flap of skin that hangs beneath the chin of an animal. More generally, 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. There are also dewlaps on dogs such as the English Springer Spaniel, the Basset Hound or the Mastiff (pictured). Also common on certain breeds of rabbit, such as the New Zealand white rabbit.

Reptiles, most notably the anole species of lizard, have the ability to extend and retract their dewlaps, which are of a different color from the rest of their body. Males use them to intimidate rivals and woo females. They are larger than the female dewlap. The dewlap is primarily used to make themselves look bigger as a defense tactic.

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A zebu above has a fairly large dewlap, not to mention the odd hump.

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