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Range DescriptionApus acuticauda is known from just a few breeding colonies in the Himalayan foothills in Bhutan, and the hills of Meghalaya, Nagaland and Mizoram, north-eastern India (BirdLife International 2001, Chantler 2005, Ahmed et al. 2007, K. D. Bishop in litt. 2013, J. Eaton in litt. 2013, M. Sharma in litt. 2013). Its seasonal movements and wintering areas are virtually unknown. There are records throughout the year from India and during the non-breeding season from north-western Thailand and Yunnan, China (J. Hornskov in litt. 2005). There are unconfirmed reports of the species from Myanmar and Cambodia (per J. W. Duckworth in litt. 2013). At known breeding colonies, the number of birds ranges from a few to more than 250 (C. Robson in litt. 2013), and the total population may not exceed 1,000 individuals.