Fauna : 36 species of mammals have so far been recorded – Tiger, Elephant, Leopard, Jungle Cat, Bears, Small Indian Civet, Squirrels, Gangetic Dolphin, Slow Loris, Assamese Macague, Rhesus Macaque, Capped Langur, Hoolock Gibbon, Wild Pigs, Sambar, Barking Deer, Water Buffalo, Feral Horses etc.
Avifauna : It is an identified Important Bird Area (IBA) having more than 382 species of Birds, some of which are Greater Adjutant Stork, Lesser Adjutant Stork, Greater Crested Grebe. Large Cormorant, Open bill Stork, Black necked Stork, Large Whistling Teal. Grey leg Goose, Grey-headed Fishing Eagle, Griffon Vulture, Osprey, Crested Serpent Eagle, Spot Billed Pelican, White Winged Wood Duck, Baer’s Pochard, Greater Spotted Eagle, Pale Capped Pigeon, Great Pied Hornbill, Marsh Babbler, Jerdon’s Babbler, Black Breasted Parrot bill, etc. The Park is renowned for natural regeneration of Salix trees.