Has been suggested that race polivanovi merits species status, but considered by some authors to represent one end of a geographical cline#R; Mongolian birds proposed as separate race, mongolicus, but differences from polivanovi minimal (slightly purer grey mantle lacking dark streaks, slightly darker back, rump and breast sides, slightly smaller size) and may involve minor clinal variation; in both cases, separation was based largely on presumed “huge” gap between N & S forms, but several populations since found in intervening areas and likely that species will prove to have more continuous range. Populations of this species in coastal Tianjin Municipality (N & S Hebei) and coastal Liaoning, in E China, presumed to belong to nominate race. Two subspecies currently recognized.
Food and feeding
Status and conservation
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