Often considered a subspecies of C. aeruginosus (which see), with which it hybridizes in E Siberia#R. Until recently, also thought to be conspecific with C. spilothorax, which now treated as a separate species owing to its smaller size (1); polymorphic plumage, with a practically all-black morph and another with solidly black (instead of streaked) throat, both unreported for spilonotus (2); pale-morph spilothorax (closest to spilonotus) darker than spilonotus and with dark tips of flight-feathers, which are generally much paler and concolorous with rest of feather in spilonotus (2); pale-morph spilothorax has more densely streaked throat than spilonotus (1); sedentary behaviour (2)#R. Monotypic.
SE Siberia and Mongolia to Ussuriland, Sakhalin, NE China and N Japan; winters from SE Asia, S China, Korea and S Japan to Indonesia (mainly Sumatra and N Borneo) and Philippines.
Food and feeding
Status and conservation
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