Tickell’s Leaf Warbler Phylloscopus affinis is Himalayan counterpart of Alpine Leaf Warbler P. occisinensis. Occurs in Tibet near borders of Nepal, India, and Bhutan, with both western (perflavus) and eastern (affinis) subspecies probably present on Chinese territory. Nearly identical to Alpine Leaf Warbler, but perflavus is generally more olive-brown above and uniformly citron-yellow on underparts. Song a slightly faster and higher-pitched trill than Alpine 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.