The largest member of the dolphin family is the ORCA, also known as the Killer Whale. It is the largest species of the oceanic dolphin family and can grow up to 32 feet in length and weigh up to 6 tons. Orcas are found in all oceans around the world and are highly social animals that live in groups called pods. They are apex predators and feed on fish, squid, and marine mammals such as seals and whales.