Koshi Tappu Wildlife Reserve (175 sq km) is is one of the finest sub tropical bird-watching site in South Asia. Bird-watching along the eastern embankment at dusk and dawn is one of the most exciting pleasure trips in the reserve. More than 500 species of birds - many seen no where else in Nepal (14 endemic species) - have been recorded, including 20 Duck Species, 7 storks, 2 Ibis species, White Tailed Stonechat, Striated Marsh Warbler, 30 Shore Birds, 114 Water Birds, and the 17 globally threatened species (including endangered Swamp Partridge and Bengal Florican). The Koshi Barrage is an extremely important resting place for many migratory birds, containing 87 winter and trans-himalayan migratory species.