The term FISH-EATING COASTAL BIRD can be summarized as a bird that lives near the coast and eats fish. The three letter acronym ERN is used to refer to this type of bird, which is a species of large wading birds in the family Laridae. These birds are found in both the Old and New World, and they typically feed on fish, crustaceans, and other aquatic animals. They are often seen along the shorelines of oceans, estuaries, and other coastal areas.