The term 'Coastal Eagle' refers to two different species of birds, the ERN (three letters) and the ERNE (four letters). The ERN is a small species of eagle found in Europe, North Africa, and parts of Asia. It has a white head and tail, and brown wings and body. The ERNE is a larger species of eagle found in coastal areas of Europe, North Africa, and parts of Asia. It has a white head and tail, and dark brown wings and body. Both species are known for their powerful flight and hunting abilities.