  left|thumb|glaucous gull the glaucous gull (larus hyperboreus) is a large gull which breeds in the arctic regions of the northern hemisphere and the atlantic coasts of europe. it is migratory, wintering from in the north atlantic and north pacific oceans as far south as the british isles and northernmost states of the usa, also on the great lakes. a few birds sometimes reach the southern usa and northern mexico. this species breeds colonially or singly on coasts and cliffs, making a lined nest on the ground or cliff. normally, 2â4 light brown eggs with dark chocolate splotches are laid. thumb|left|in flight with great black-backed gulls, ottawa, ontario this is a large and powerful gull, very pale in all plumages, with no black on either of the wings or the tail. the term glaucous describes its colouration. adults are pale grey above, with a thick yellow bill. immatures are very pale grey with a pink and black bill. this species is considerably larger, bulkier and thicker-billed than the similar iceland gull, and can sometimes equal the size of the great black-backed gull, the largest gull species. they can weigh anywhere from , averaging  in males and  in females. at the colony on coats island in canada, the gulls are nearly 15% heavier than other known populations, with a mean weight  in males and . thus, coats island glaucous gulls are about the same weight as great black-backed gulls or even marginally heavier and their maximum weight is greater.crc handbook of avian body masses, 2nd edition by john b. dunning jr. (editor). cr
Arctic_birds Birds_of_Europe Birds_of_Greenland Birds_of_North_America Birds_of_Turkey Gulls IUCN_Red_List_least_concern_species Larus