Among fish species, the grunts (Haemulidae family) might be an example. Some of these fish grind their pharyngeal teeth, making a grunt-like noise.
Cheers, Kate Kate L. Mansfield, Ph.D. Postdoctoral Associate University of Miami Rosenstiel School of Marine and Atmospheric Science 4600 Rickenbacker Causeway Miami, FL 33149 Email: [EMAIL PROTECTED] Phone: 305-421-4208 Office: 107 S. Grosvenor