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Phylloscopus tytleri
It breeds in the north-western Himalayan region and is suspected to breed in the Garhwal and Kumaon Himalaya. Its natural habitat is subtropical or tropical moist montane forest, and it is threatened by habitat loss (Wikipedia, general species account).
In museum specimens the thin bill is clear, with a long exposed nasal groove along it, the rictal bristles are short and few and the feathering at the base of the bill is reduced, giving a very pointed face profile (Wikipedia, general species account).