Baikal Bush Warbler

The Baikal bush warbler is a secretive and poorly known warbler of southern eastern Siberia. The back, wings and tail are dark brown, the underside whitish, and the undertail reddish-brown with whitish spots. There are dark brown lengthwise mottles on the crop and breast. It sings day and night deep in thickets, raising its head, lowering its wings and stretching its tail horizontally; the song is a monotonous, sharp two-syllable cry, trzi, trzi. (Russian Wikipedia, general species account)

Its range runs from the foothills of the northern Altai, the Abakan basin and the northern foot of the West Sayan to southern Baikal and the upper Amur basin, including Chita and Nerchinsk and the Greater Khingan in China, and by 2010 it had settled the Pogranichny range in Primorye. It nests in brushwood piles and fallen branches overgrown with grass, in a round, domed nest like a leaf warbler's, with four to six white, faintly pink eggs speckled brown-violet. The female sits so tightly that she can sometimes be caught by hand. (Russian Wikipedia, general species account)