In the Nile River of Africa, there lives a fish called the electric catfish. Like the electric eel, it generates a current and, if we are to believe supposedly authentic reports, uses its electricity not simply for defense but to capture the food.
So, how do electric fish hunt? It swims along until it discovers another fish in the process of digesting a meal, swims near and flicks on its current. The astonished victim vomits its meal in surprise and pain, and the catfish rapidly gobbles up the stuff.