Wood Warbler Phylloscopus sibilatrix breeds British Isles to Ural Mountains; winters sub-Saharan Africa. Rare in Altai Mountains in northern Xinjiang; very rare vagrant to coast. Breeds in deciduous forests. Lemon-yellow supercilium, throat, and breast sides contrast with otherwise clean white underparts. Wings long, pointed. Eye-stripe blackish, downward-hooked. Upperparts bright green, greyish-green when worn. Wings and tail blackish with yellowish-green fringing on wing coverts, tertials, primaries, secondaries, and tail feathers. Tertials, remiges, and tail feathers tipped white when fresh. Bill, feet yellowish-brown. Highly distinctive song begins with sharp call notes and ends in pulsating trill. Call a fluty “tyyh.” — Craig Brelsford
Daniel Bengtsson served as chief ornithological consultant for Craig Brelsford’s Photographic Field Guide to the Birds of China, from which this species description is drawn.