https://www.nps.gov/articles/phyllodont-fish-tooth-plate.htm
Phyllodont Fish Tooth Plate (U.S. National Park Service)
u s national parkfish toothplateservice
https://www.sciencedaily.com/releases/2010/11/101104154212.htm
To punish or not to punish: Lessons from reef fish and saber-tooth blennies | ScienceDaily
Researchers have experimentally shown that some species of reef fish will enact punishment on the parasitic saber-tooth blennies that stealthily attack them...