Bangladesh (NB), China (mainland) (B), India (B), Laos, Myanmar (B), Thailand (NB), Vietnam (B).
North-eastern India, Myanmar and southern China (Yunnan and western Sichuan east to Guizhou and Guangxi). Non-breeding also Bangladesh, northern Thailand and northern Indochina.
 
Population
Estimated population is unknown (2010).
Voice
Mostly silent. A thin 'seep' in contact and at the nest. A high-pitched, staccato 'chi-lit' in alarm. Song, by males, either a two prolonged, descending whistles 'wheeer-dooo' or the same notes broken up and extended into a series of far-carrying whistled trills, often upslurred.
The Reader's Digest Book of British Birds 1980, 3rd Edition, Drive Publications Ltd ISBN 0 340 25308 8
Birds in Colour Campbell, B., 1960, Penguin Books Ltd
The Pocket Guide to Nest and Eggs Fitter, R.S.R., 1954, Collins
RSPB Handbook of British Birds Holden, P., Cleeves, T., 2002, A & C Black ISBN 0 7136 5713 8
Birds of Britain and Europe Sterry, P., et al., 2001, AA Publishing ISBN 0 7495 3068 5
The Popular Handbook of British Birds Hollom, P.A.D., 1973, H.F. & G. Witherby Ltd ISBN 0 85493 002 7