= seabird, living on the coasts of large bodies of water; white with gray or black back and upper wing surfaces; it has long flexible wings; it feeds on fish or plankton, usually settling on the water to feed; some dive into the water for their food, and many are also shoreline scavengers, eating dead fish, crabs, and shellfish; Larus ridibundus, Larus argentatus, Sterna hirundo, Sterna albifrons; unclean and therefore not to be eaten