What is "glaucous gull"

n. ''Larus hyperboreus'', a large gull which breeds in the Arctic.

The glaucous gull (Larus hyperboreus) is a large gull, the second largest gull in the world which breeds in the Arctic regions of the Northern Hemisphere and the Atlantic coasts of Europe. The genus name is from Latin Larus which appears to have referred to a gull or other large seabird. The specific hyperboreus is Latin for "northern" from the Ancient Greek Huperboreoi people from the far north " Glaucous" is from Latin glaucus and denotes a bluish-green or grey colour.

This gull is migratory, wintering from in the North Atlantic and North Pacific oceans as far south as the British Isles and northernmost states of the United States, also on the Great Lakes. A few birds sometimes reach the southern USA and northern Mexico.