RANGE EXPANSION OF THE GLAUCOUS-WINGED GULL INTO INTERIOR UNITED STATES AND CANADA

Abstract

Historically, the Glaucous-winged Gull (Larus glaucescens) has been considered an almost strictly coastal species in North America, only occasionally straying far inland. It breeds along the Pacific coast and on nearby inland lakes from Alaska south to northwestern Oregon, and wintersfrom the Bering Sea south to southern Baja California and the Gulf of California (A.O.U. 1983; Verbeek 1993).