The little but very mighty piranha fascinates everyone. People come to the Amazon expecting to see a monstrously large fish. In fact, the largest piranha is about two feet long, and most are considerably smaller. Yet they earn their reputation. Their powerful jaws and razor sharp triangular teeth enable one small fish to kill a cow. There are many types of piranha . . . in some areas the piranha never bite people. In other areas they may. However, there is no verified report of any human ever being killed by one of these sharp-toothed fish. That only happens in Hollywood.