The world is littered with predators and scavengers who totally live and feed on flesh of other animals. Just as there are many predatory species, there has to be many successful prey species, without which the predators would not be fed properly. The oceans and seas have more predators than the land. There it is a big-fish eats small-fish culture. In fact it is biggest fish (whale shark) eat very small fish (krill). Learn about the factors that would make a predator really successful.