The term 'porpoise cousins' refers to the orca, also known as the killer whale. Orcas are the largest member of the dolphin family and are found in all oceans around the world. They are highly intelligent and social animals, living in pods of up to 40 individuals. Orcas are apex predators, meaning they have no natural predators, and feed on a variety of prey including fish, seals, and even whales.