The darker the color, the more favorable the climate conditions are for survival. The outlined areas represent approximate current range for each season. More on reading these maps.
Over much of the past century, this huge, omnivorous gull has been, in a word, successful. Its range has expanded south along the Atlantic coast and inland to the Great Lakes. There may be additional changes ahead for the aggressive and adaptable Great Black-backed Gull, as the Audubon climate model forecasts significant shifting of the climate space in both summer and winter. Of concern in the summer, only 40% of the current range remains climate stable, and while large areas of the interior and western portions of the continent may become available it remains to be seen if this hulking predator will be able to rapidly shift with the changing climate space.