Nepal Cupwing

The Nepal cupwing, also known as the Nepal wren-babbler or immaculate cupwing, is a small passerine of the family Pnoepygidae, 8.5–10 cm long and brownish-olive. It has dark scaling on the upperparts and paler scaling on the underparts, a scaly breast with brown central feathers, pale edging on the flight feathers and a very short tail (Wikipedia, general species account).

The song is distinctive and higher pitched than the other species in the genus, a steady series of thin, short, rapid, modulated whistles that descend in pitch. It is not migratory, but altitudinal movements occur, with winter records down to 250 m; it occurs regularly between 1,800 and 2,200 m and possibly breeds as high as 3,100 m (Wikipedia, general species account).