mouth of the Columbia River.
Occasionally included in expanded H. ostralegus. Name H. frazari may be invalid, referring to a hybrid swarm formed between present species and H. palliatus in Gulf of California and W Mexico; the hybridization in this overlap zone is limited. Monotypic.
W Aleutian Is (Kiska I) through S Alaska (including Round I), W Canada and W USA to NW Mexico (Los Coronados Is and Baja California). Outside breeding season, mostly concentrated between S British Columbia and Baja California.
Food and feeding
Status and conservation
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