English: Radde’s Warbler, Radde’s Bush-warbler, Radde-s Leaf Warbler
Russian: Толстоклювая пеночка 
Mongolian: Цангинаа дуучшувуу
German: Bartlaubsanger
French: Pouillot de Schwarz  
Japanese: カラフトムジセッカ (Karafuto-mujisekka)     

Body length: 11 ½-12 ½ cm.

Breeds in Siberia in the taiga; requires glades beside watercourses with rank undergrowth. Migratory, winters in SE Asia; rare autumn vagrant Europe.

Identification: Willow Warbler size but sturdier, with slightly larger head (often with steeper forehead in profile), stronger bill and legs. Rather dark brown with olive-grey cast above, off-white below with warm yellow-buff (or more olive-brown) tone on breast, flanks and, especially, vent and undertail-coverts. Strong pale supercilium and dark eye-stripe. Told from Dusky Warbler by: thicker bill; thicker and on average paler pinky-brown legs; in front of eye supercilium dorsally more diffusely defined, broad and in fresh plumage yellow-buff, behind eye usually whitish. A bit more sluggish in movements than Dusky, not so active and restless.