piscivore

thumb|Northern water snake (Nerodia sipedon) eating a [[catfish]] thumb|An Atlantic puffin with a mouth full of [[lesser sand eels]]

A piscivore () is a carnivorous animal that primarily eats fish. Fish were the diet of early tetrapod evolution (via water-bound amphibians during the Devonian period); insectivory came next; then in time, the more terrestrially adapted reptiles and synapsids evolved herbivory.