Eaglenest or Eagle's Nest Wildlife Sanctuary is a protected area of India in the Himalayan foothills of West Kameng District, Arunachal Pradesh. It conjoins Sessa Orchid Sanctuary to the northeast and Pakhui Tiger Reserve across the Kameng river to the east. Altitude ranges extremely from 500 meters to 3,250 meters. It is a part of the Kameng Elephant Reserve.
The sanctuary is notable as a prime birding site due to the extraordinary variety, numbers and accessibility of bird species there.
Eaglenest is well known as a major birding area. It is home to at least 454 species of birds including cormorants, herons, Black Stork, Oriental White and many more. The sanctuary has the distinction of having three tragopan species, perhaps unique in India. It is home to a wide variety of Herpetofauna including species of amphibians, snakes and lizards including geckos, agamids and skinks. Other rare species include Darjeeling False-wolfsnake which was only known to science through 5 specimens, Anderson's Mountain lizard, Gunther's Kukri Snake, Common Slug Snake, and Keelback snakes which have not been definitively identified. It is also home to at least 15 species of mammals including the endangered Capped Langur, Bengal tiger, Asian Elephant, Red Panda, Asiatic Black Bear and the vulnerable Assamese Macaque, Arunachal Macaque and Gaur. This sanctuary is home to at least 165 species of butterflies including Bhutan Glory, Grey Admiral, Scarce Red-Forester, Dusky Labyrinth, Tigerbrown, Jungle-queen sp, White-edged Bush-Brown and White Owl.