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The killer whale, also known as the orca, is the largest species of dolphin. Killer whales can be found in many different places, from the polar regions to the temperate waters. Even though they live in all oceans and seas worldwide, they are more common in the Arctic & Antarctica. Killer whales hunt in packs and use advanced hunting strategies. Their diets are very vast and diversified and depend on the class each individual belongs to. The resident killer whales (fish eaters) prey on large fishes, such as tuna, Mackerel, Squid, Giant Pacific Octopus, and they appear to have a predilection for salmon. The transient killer whales (mammal eaters) prey on the other hand mostly on marine mammals such as seals, sea lions, walruses, dolphins, porpoises, seabirds, sea turtles, baleen whales and other toothed whales. The offshore killer whales are the most enigmatic, their diet appears to share similarities with resident killer whales, however they have been known for preying on sharks (including tiger sharks and great white sharks) and manta rays. Killer whales are black and white and have a white patch on each of their face. Killer whales usually use echolocation to find fish, seals or whales and swim up to 30 miles per hour able to catch swordfish, tuna, fur seals, penguins & dolphins. Their teeth are up to 3 inches long, giving them the ability to feed on slippery tuna, hard-shelled sea turtles & blubbery seals or sea lions. They have blood connections in their tail, making them swim faster, and their pad-like flippers steer them when they chase prey. Male killer whales are larger, heavier and have longer dorsal fins than females. Males can reach up to 10,000 tons & 9 meters and 29.5 feet long. Females can reach up to 7,500 kilograms, 7.7 meters and 25.5 feet long. Calves can be 7 to 9 feet long and weigh 180 pounds. Killer whales are at the top of the food chain, so they have no natural predators.