Surprisingly, some of the ocean's biggest creatures are harmless. The blue whale, the largest animal on Earth, weighs as much as 33 elephants and feeds only on krill. However, the requirements for dominating the ocean's food chain include hunting skills, a big appetite, few predators, and often, sharp teeth.
Killer whales are apex predators with no natural enemies. They hunt in groups, feeding on a wide range of prey, including fish, seals, sharks, and even other whales.
Great white sharks detect blood from miles away and sense movement up to 820 feet. With powerful bodies and sharp teeth, they hunt sea lions, seals, dolphins, turtles, birds, and carrion.
Though land mammals, polar bears are strong swimmers and often venture hundreds of miles from shore. They primarily eat seals but also hunt belugas, narwhals, whales, walrus, and occasionally fish.
Leopard Seal – As one of Antarctic’s most ferocious predators, they have wide, powerful jaws and sharp teeth, they easily tear apart penguins and seal pups.
Sea Lion – Their only natural predators are killer whales and sharks, placing them among the ocean's top hunters. As opportunistic feeders, they eat a wide range of fish, squid, octopus, and smaller seals.