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A truffle is a variety of edible fungus of the genus Tuber, often used in upscale cuisine. Although there are dozens of varieties of truffle, the ones that are most commonly available commercially are the black truffle (French), the alba white truffle (Italian), and the very similar Oregon White truffle (USA). Specialized pigs and dogs are used to search for truffles, taking advantage of their keen sense of smell. In recent years, dogs have become more popular as truffle hunters because, unlike pigs, they don't try to eat the truffles themselves.