In China, Yellow-streaked Warbler Phylloscopus armandii perplexus breeds Ningxia and Hubei south to Yunnan and southeast Tibet. Winters southern and western Yunnan and Guizhou. Nominate breeds eastern Tibet and eastern Qinghai to Liaoning; winters western and southern Yunnan. HABITAT Breeds in thickets of poplar and willow, to 3500 m (11,480 ft.); non-breeding below 1500 m (4,920 ft.). ID & COMPARISON Very similar to Radde’s Warbler P. schwarzi. Distinguishable by slightly smaller size and head, thinner bill and legs, proportionately longer tail, more uniformly colored buffish supercilium, and faint yellow streaking on throat, breast, and sometimes belly (not always apparent in worn individuals). Supercilium may show some contrast, being buffier anteriorly and whiter posteriorly, though generally contrasts less than Radde’s. Buff-throated Warbler P. subaffinis, Sulphur-bellied Warbler P. griseolus, and Tickell’s Leaf Warbler P. affinis all show clear yellow in supercilium and have finer bill and legs. Buff-throated and Tickell’s also greener above. BARE PARTS Short bill shows decurved culmen and is brown above, yellowish brown below. Feet yellowish-brown, sometimes a bit lighter than Radde’s. VOICE Song very similar to Radde’s, but weaker and often introduced by call; tzic call more bunting-like than similar call of Radde’s and Dusky Warbler P. fuscatus. — 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.