There are many parts of the mouth and throat (the oral cavity) that are used in the production of speech sounds. In terms of place of articulation, consonants can be grouped into bilabials, labiodentals, dentals, alveolars, palatals, velars, and glottal. Bilabial refers to a sound articulated by bringing together the upper and lower lips. For example, English /m/, /p/ and /b/ in the words my, pet, bird.