A Seaworld entertainer is a SEAL, which is a four-letter word. Seals are marine mammals that live in the cold waters of the Arctic and Antarctic regions. They are carnivorous and feed on fish, squid, and crustaceans. Seals have a thick layer of blubber that helps them stay warm in the cold water. Seals are also known for their playful behavior and acrobatic abilities, which make them popular attractions at Seaworld.