An apex predator is a predator at the top of the food chain. Every, single enviroment has an apex predator. They're what keeps ecosystems in balance. In the United States, the Grizzly Bear is that apex predator. In Russia, that role belongs to the Siberian Tiger. It is rare for 2 apex predators to hunt in the same area, though. While it has happened, it is just super-rare. If, in fact, 2 apex predators hunted in the same territory, they would fight to the death. It is also vital for an enviroment to have more prey than predators for the carnivores to have more food.