Comments: Seacoasts, beaches, bays, and mudflats (AOU 1983). Nests inland along marshes, lakes, and rivers or along the rocky or sandy seacoast. May nest on the ground or occasionally in trees. Usually nests on islands. NON-BREEDING: In winter in British Columbia, tens of thousands frequent agricultural fields. Seldom found far offshore, but often feeds at herring spawning areas and along lines of tide convergence (Campbell et al. 1990).