The other vulnerable species are the chestnut-breasted partridge (Arborophila mandellii), wood snipe (Gallinago nemoricola), Blyth's tragopan (Tragopan blythii), greater spotted eagle (Aquila clanga), imperial eagle (Aquila heliaca), Baer's pochard (Aythya baeri), Hodgson's bushchat (Saxicola insignis), dark-rumped swift (Apus acuticauda), and grey-crowned prinia (Prinia cinereocapilla).The Conservation Area of 163 sqkm , which includes Gewogs of Phobji, Gangte and Bjena under the Wangdue Phodrang dzongkhag, has been leased out for Conservation Planning and Management to the Royal Society for the Protection of Nature (RSPN), a non-governmental organization (NGO) set up in Bhutan in 1987 (legally incorporated in 1997).