Lampreys (sometimes also called lamprey eels) are a family of jawless fish, whose adults are characterized by a toothed, funnel-like sucking mouth. Lampreys have long been used as food for humans and were highly appreciated by ancient Romans. During the Middle Ages, they were widely eaten by the upper classes throughout Europe, especially during fasting periods, since their taste is much meatier than that of most true fish. Queen Elizabeth's coronation pie was made by the Royal Air Force using lampreys. In southwestern Europe (Portugal, Spain, and France), larger lampreys are still a highly prized delicacy. Overfishing has reduced their number in those parts and they are an endangered species in some areas. Lampreys are also consumed in Sweden, Finland, Russia, the Baltic countries and South Korea.