sentences:  Juvenile birds have a partial moult in the same period, replacing the head, body and some wing covert feathers.The only species that can potentially be confused with the Siberian accentor is the related black-throated accentor, since first-autumn birds of the latter species may have a relatively inconspicuous dark throat.The Siberian accentor is still distinguishable by its rustier back colour, yellow (not off-white) supercilium and the absence of a white line below the black face mask.