Notable among the 485 bird species are Watercock, Indian nightjar, Dusky eagleowl, Black-headed cuckooshrike, Whitetailed stonechat, Striated grassbird, Large adjutant stork, Pallas's fish eagle, Common golden-eye, and Gullbilled tern. Bengal Florican, Swamp Francolin and Nepal Rufous-vented Prinia occur as well.
Aqua Bird Unlimited - Koshi Tappu
The Koshi Tappu Wildlife Reserve is a protected area in the Terai of eastern Nepal covering 175 km2 (68 sq mi) of wetlands in the Sunsari, Saptari and Udayapur Districts. In altitude it ranges from 75 to 81 metres (246 to 266 ft) and consists of extensive mudflats, reed beds, and freshwater marshes in the floodplain of the Sapta Kosi River. It was established in 1976 and designated as a Ramsar site in December 1987.
Fauna
A wide range of faunal species inhabit the protected area. In its water courses and ponds, 200 species of fish have been recorded, most of which are resident. Two toad species, nine frog species, six lizard species, five snake species, 11 turtle species are recorded. Gharial and Mugger crocodile occur as well.
Mammals
The 31 species of mammals recorded include the Asian elephant, Spotted deer, Hog deer, Wild pig, Smooth-coated otter and Golden jackal. The Ganges River Dolphin has been sighted in the Koshi River. Gaur and Blue bull have declined in numbers. Nepal's last remaining population of about 150 Wild Asian Water Buffalo called arna inhabit the area.
Birds
Notable among the 485 bird species are Watercock, Indian nightjar, Dusky eagleowl, Black-headed cuckooshrike, Whitetailed stonechat, Striated grassbird, Large adjutant stork, Pallas's fish eagle, Common golden-eye, and Gullbilled tern. Bengal Florican, Swamp Francolin and Nepal Rufous-vented Prinia occur as well.