The Siberian accentor (Prunella montanella) is a small passerine bird which breeds in northern Siberia on both sides of the Urals. It is migratory, wintering in southeast Asia. It is a rare vagrant in western Europe.This is a dunnock-sized bird, 13-14.5 cm in length. It has a streaked reddish-brown back, but adults have a brownish-black crown, dark cheeks, and a buff supercilium. The entire underside is yellowish rusty-buff.