Recent genetic data#R found this species to be sister to C. pallida, the two being closely related to C. obsoleta; appears to hybridize with C. obsoleta and has been suggested as being conspecific (see that species). Geographical variation complex but may be largely clinal, plumage becoming more greyish above and more whitish below towards S; within populations assigned to nominate race, variation in crown streaking evidently great, with streaking reduced in SE Brazil but many birds elsewhere at least as streaked as striaticeps, and those from lowland S Bolivia closer in appearance to nearby montane population of striaticeps but with undertail-coverts as in nominate; further study needed. Three subspecies recognized.
Food and feeding
Status and conservation
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