Hume's Leaf Warbler

Hume's leaf warbler is one of the smallest Old World warblers, greenish above and off-white below. With its long supercilium, crown stripe and yellow-margined tertials it is very similar to the yellow-browed warbler, but it has only one prominent light wing bar with just a faint trace of the second, shorter bar, and overall duller colours, plus a dark lower mandible and legs. Its song is buzzing and high-pitched, and the more disyllabic call is the best distinction from the yellow-browed warbler. (Wikipedia, general species account)

This is a common bird of mountain woodlands at altitudes of up to 3,500 metres. It occurs from the Hindu Kush and Karakoram east and north to the Tien Shan in China and the Altai Mountains in Mongolia. The eastern form mandellii, found on the eastern Tibetan Plateau, is sometimes treated as a full species. Both populations migrate over the Himalayas to winter in India and adjacent regions, and the species has also been recorded in the Kutch region. (Wikipedia, general species account)