Marine predators are animals that hunt and feed on other sea creatures. Two of the most well-known marine predators are orcas, also known as killer whales, and eels. Orcas are large toothed whales that live in all oceans and feed on fish, squid, and other marine mammals. Eels are long, snake-like fish that inhabit shallow coastal waters and feed on smaller fish and crustaceans. Another lesser-known marine predator is the ern, a type of seabird that feeds on small fish and squid.