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MOUTH ; in most animals, a cavity in the anterior part of the body, but very differently formed in different sorts of animals. It commonly serves for the reception of food, and is connected by a canal with the interior parts of the body, where the food is assimilated. In the higher orders, it is used for mastication, the emission of sound, deglutition, respiration, suction and taste, being connected with organs which perform those processes. The lower jaw only is movable in this division. Some of the lower orders seem to be without a mouth, and to nourish them selves by absorption. In birds, the external parts of the mouth are a hard, bony substance, and it is not fitted for suction. In insects, the form of the mouth is very various.