The wildlife reserve and Koshi Barrage lies in the eastern Terai along the east west high way. A very large number of birds are seen along the wide Koshi River and in the grassland and marshes. About 26 species of Ducks are seen in the numerous ponds. Birds found in these areas are Black Ibis, Honey kites, Os preys, Marsh & Pied Harriers, Stork Billed Kingfishers, Black Headed Orioles, Himalayan Ruby Throat, Peregrine Falcon, Patridges, Sand Pipers etc. Over 450 species of birds have been sighted here.