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A wattle is a fleshy caruncle hanging from various parts of the head or neck in several groups of birds, mammals and other animals. A caruncle is defined as 'A small, fleshy excrescence that is a normal part of an animal's anatomy'. Within this definition, caruncles in birds include wattles, dewlaps, snoods and earlobes. Wattles are generally paired structures but may occur as a single structure when it is sometimes known as a dewlap. Wattles are frequently organs of sexual dimorphism. In some birds, caruncles are erectile tissue and may or may not have a feather covering.
Wattles are often such a striking morphological characteristic of animals that it features in their common name. For example, the southern and northern cassowary are known as the double-wattled and single-wattled cassowary respectively, and there is a breed of domestic pig known as the red wattle.
In birds, wattles are often an ornament for courting potential mates. Large wattles are correlated with high testosterone levels, good nutrition and the ability to evade predators, which in turn indicates a potentially successful mate. It has also been proposed that ornamental organs such as wattles are associated with genes coding for disease resistance.
Birds with wattles include:
Mammals with wattles include:
A common pheasant (Phasianus colchicus) with bright red facial wattles
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