Knipolegus aterrimus heterogyna
Hitherto treated as conspecific with K. aterrimus, but differs in its (in female) darker, better-defined cap offset by vague whitish collar (1); buff-white rump-band and whitish uppertail-coverts vs pale chestnut rump and uppertail-coverts (3); all-dark vs rufous-edged outer rectrices (2); white vs pale rufous vent (ns); three-note vs two- or one-note song (2), lower-pitched than songs of the others (1). Monotypic.
N Peru (Marañón Valley from Cajamarca S to Ancash).
Food and feeding
Status and conservation
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