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.
This bruiser of a gull is the northern ecological counterpart of the Western Gull. It breeds coastally from the Bering Sea south to around the Puget Sound, where it comes into contact with—and hybridizes with—the Western Gull. Audubon's climate model forecasts only modest changes in the total amount of climatically favorable space, but large-scale geographic disruptions may be in the offing, as only 20% of the existing summer range remanis stable and new areas of suitable climate space open up in eastern Canada. If Glaucous-winged Gulls establish a toehold so far from their current West Coast haunts (very doubtful), wildlife managers will be closely monitoring their interactions and possible hybridization with other gull species.