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The vocal tract is that cavity in animals and humans, where sound that is produced at the sound source ( Larynx in mammals; Syrinx in birds) is filtered. In Birds it consists of the Trachea , the Syrinx , the oral cavity, the upper part of the Esophagus , and the Beak . In Mammals it consists of the laryngeal cavity, the Pharynx , the oral cavity, and the nasal cavity, and in some nonhuman mammals maybe also the Airsacs .