Bering Sea and Sea of Okhotsk.
Until recently lumped with B. marmoratus, but differs in larger size, published data#R giving effect size for bill 3.9 (2); clear white or lightly barred white vs densely grey-and-white barred chin and throat (2); more distinctly barred upperparts in summer and winter (marmoratus greyer and unbarred in winter) (2); crown colour and pattern uniform with upperparts in summer and winter (blackish in summer and winter in marmoratus) (ns); “narrow, white marginal stripe on outermost rectrix”#R (ns); no bold white half-collar in winter (3). Monotypic.
Kamchatka and Sea of Okhotsk S to N Japan (Hokkaido). Winters mainly into S parts of Sea of Okhotsk and Japan.
Food and feeding
Status and conservation
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