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Wattle (anatomy) : ウィキペディア英語版 | Wattle (anatomy)
A wattle is a fleshy caruncle hanging from various parts of the head or neck in several groups of birds and mammals. 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.〔John James Audubon, Dean Amadon, John L Bull. 1967 ''The Birds of America''〕〔Richard Bowdler Sharpe. 1888. ''Catalogue of the Birds in the British Museum'', British Natural History Museum, Department of Zoology〕 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. ==Birds==
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