Pallas's Grasshopper-warbler

Pallas's grasshopper warbler, or rusty-rumped warbler, is a migratory warbler slightly larger than the common grasshopper warbler, with a streaked brown back, grey-white underparts and white tips to the tail and tertials. The sexes look alike and young birds are yellower below. It is skulking, creeping through grass and low foliage and hard to see except when singing (Wikipedia, general species account).

It breeds in tall grass and wet meadows near water in the eastern Palearctic, from the Altai and Mongolia to north-east China, Korea, Sakhalin and the Kuriles, building a ground nest in grass with four to seven eggs. It winters from India east to Indonesia and is rare in Sri Lanka. The source does not name Nepal. It is named for Peter Simon Pallas and has five subspecies (Wikipedia, general species account).