Odontocetes produce sounds via an organ similar to the nose in humans. Thus, the process can be anatomically likened to humming. Odontocetes have a physical structure, anatomically comparable to the nasal cavity in humans, called phonic lips. When air is passed through the phonic lips, the area around the lips vibrates, creating finely adjustable sounds. These sounds are then transferred to a fatty organ in the forehead called the melon, which directs the sound in the intended direction.