Sabine's gull steals eggs from nesting colonies of Arctic terns. The Sabine's gull is a small gull, in length and weighing . The wings are long, thin and pointed with a span of between . The bill, which is black with a yellow tip, is around long. This species is easy to identify through its striking wing pattern. The adult has a pale grey back and wing coverts, black primary flight feathers and white secondaries. The white tail is forked. The male's hood darkens during breeding season. Young birds have a similar tricoloured wing pattern, but the grey is replaced by brown,
Iceland gull Iceland gull The Iceland gull ("Larus glaucoides") is a medium size gull which breeds in the Arctic regions of Canada and Greenland; although not in Iceland (as its name suggests), where it is only seen during winter. The genus name is from Latin "Larus" which appears to have referred to a gull or other large seabird. The specific "glaucoides" denotes its resemblance to "Larus glaucus", a synonym of "Larus hyperboreus", the glaucous gull; "-oides" is Ancient Greek and means "resembling". It is migratory, wintering from in the North Atlantic as far south as the British Isles and northernmost states of