The piranhas are bigmouths
Fish are a lot chattier than had been thought. A team of researchers at the University of Liège has for several years been studying the sounds they emit in the water. Whether it is to find a sexual partner or to see off an enemy, certain fish know how to find the right words. A recent study carried out at the University of Liège’s Functional and Evolutive Morphology laboratory has just demonstrated that piranhas sometimes start to grunt to warn that they are about to attack.
(1) Millot S, Vandewalle P, Parmentier E (2011). Sound production in red-bellied piranhas (Pygocentrus nattereri, Kner): an acoustical, behavioural and morphofunctional study. Journal of Experimental Biology 214 : 3613-3618. November 2011.