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The orca (Orcinus orca) is the largest member of the oceanic dolphin family Delphinidae. They are sometimes referred to as blackfish, a group including pilot whales, pigmy and false killer whales and melon headed whales. It is the second-most widely distributed mammal on Earth (after humans) and is found in all the world's oceans, from the frigid arctic regions to warm, tropical seas. It is also a versatile, deadly predator, eating fish, turtles, birds, seals, sharks and even other juvenile and small cetaceans. This puts the orca at the pinnacle of the marine food chain. Orcas have been known to attack massive baleen whales, in particular gray and Blue whales.

The name "killer whale" reflects the animal's reputation as a magnificent and fearsome sea mammal that goes as far back as Pliny the Elder's description of the species. Today it is recognized that the orca is a dolphin rather than a whale and that it is not a danger to humans. Aside from a boy who was charged (but not grabbed) while swimming in a bay in Alaska, there have been no confirmed attacks on humans in the wild. There have, however, been isolated reports of captive orcas attacking their handlers at marine theme parks.

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