In China, Kloss’s Leaf Warbler Phylloscopus ogilviegranti disturbans is uncommon breeder from southern Shaanxi to Sichuan and Guangdong, with some non-breeders remaining in southern parts of the breeding range; and ogilviegranti is uncommon resident in Wuyi Mountains in northwest Fujian and probably also northern Guangdong, moving to lower altitudes in winter. HABITAT & BEHAVIOR Breeds to 2500 m (8,200 ft.), in winter down to 50 m (160 ft.). Forages energetically in upper and middle canopy of mixed deciduous forest; when agitated, rapidly flicks both wings simultaneously, never opening wings fully. ID & COMPARISON Very similar to Davison’s Leaf Warbler P. davisoni and Claudia’s Leaf Warbler P. claudiae. Small to mid-sized, bright green and yellow leaf warbler with a boldly marked head and double wingbars. Race disturbans has long, broad, uniformly yellow supercilium extending to nape sides and a broad and well-defined yellow median crown-stripe (diffuse in front); long, blackish-olive eye-stripe and lores; and dark olive crown sides, turning blackish posteriorly. Upperparts bright olive-green, with broad whitish-yellow wingbar on greater coverts and less distinct wingbar on median coverts. Tail blackish-brown with green fringing; very narrow white edges to outer rectrices; tail mainly white from below. Yellowish-white chin; rest of underparts white with hint of yellow. Race ogilviegranti has more vividly green upperparts, yellower crown-stripe, supercilium and chin, and usually more extensive white in tail. BARE PARTS Bill blackish-brown above, orange below, sometimes with dark tip; feet pinkish-brown. Tit-like pit-chew call note introduces song, titsui-titsui-titsui, slightly more slurred and more rhythmic than similar song of Claudia’s Leaf Warbler. — 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.