The term relative of a blue whale can be summarized as the ORCA, which is a four letter word. The ORCA, also known as the killer whale, is a toothed whale belonging to the oceanic dolphin family. It is the largest member of this family and is easily recognizable by its black and white markings. Orcas are highly social and live in groups called pods. They are found in all oceans, from the frigid Arctic and Antarctic regions to tropical seas. Orcas are apex predators, meaning they have no natural predators. They feed on fish, squid, sea birds, seals, sea lions, and even other whales.