The Washington GAP Analysis Program applied to breeding birds only. These maps, which include wintering birds, pelagic (coastal) birds, and birds expanding their ranges, do not include range maps.
NatureMapping observations reported by townships throughout the year.
The Bonaparte's Gull is found wintering along the west coast in the State of Washington all the way south to Mexico. It breeds in Alaska, the Yukon, the Northwest Territories, as well as across Canada. Fairly common but local winter Washington resident. Common spring, fall migrant in western lowlands.Text edited by Gussie Litwer