Fauna in Rajaji Tiger Reserve has the bigger population of elephants and tigers. Other species of wild animals include: Jungle Cat, Leopard, Goral, Striped Hyena, Himalayan Black Bear, Sloth Bear, Jackal, Barking Deer, Sambhar, Wild boar, In addition, there are also some primates that include the Hanuman Langur, Indian Langur and the Rhesus Macaque. Small mammals that are mostly found in park are the Indian Hare and the Indian Porcupine. Reptiles in Rajaji include (Indian) Cobra, King Cobra, Pythons, Common Krait and the Monitor Lizard.
There are approx. 315 bird species that give a big visual treat to visitors. National bird Peacock is found in abundance. Large number of butterflies and small birds are also observed that simply add beauty to this region. Some species of birds include Babbler, Rusty cheeked Scimitar, Chestnut-tailed Starling, Golden-spectacled Warbler, Drago Cuckoo, Brown Hawk-Owl, Great Hornbill, Salty Headed Parakeets, Red Jungle Fowl, Crested Kingfishers, Lineated Barbet, Black Hooded Oriole, Finches, Khaleej Pheasant, Thrushes and many more. To thrill and experience the wilderness and the richness of species, one has to visit this place and explore the Shivalik and Himalayan Ranges in Rajaji Tiger Reserve.