This wildlife reserve Ramsar site is named after the biggest River in Nepal Sapta Koshi, it has cover the big area of the Koshi River and is very popular for bird watching, especially migratory birds. As per the previous record, there are approximately 440 species of birds that migrates from Siberia and Tibet from November to February. Many of these birds are not found in other parts of Nepal, and some even fly from Siberia during the winter months. The reserve is home to a wide range of water birds, including ducks, herons, storks, egrets, Dusky Eagle Owl, Red-necked Falcon, Bengal Formica, Great stone Plover, Black-bellied Tern, Swamp Francolin, Black-necked Stork, Marsh Warbler Lesser Adjutant Stork and ibis, which can be seen along the riverbanks.
In addition to its diverse birdlife, Koshi Tappu Wildlife Reserve is also home to a variety of wildlife species, including wild buffalo, wild boar, hog deer, spotted deer, blue ball, endangered gharial crocodile, Gangetic dolphin, and jackal. The best time to visit Koshi Tappu is between October and March.
