Conjoining the Sessa Orchid Sanctuary to the Northeast is the Eaglenest Wildlife Sanctuary, which is also a protected area at the foothills of the Himalayas, at the West Kameng District. The Red Eagle Division of the Indian Army was posted in this area during the 1950s, and hence the name 'Eaglenest'.
To the east of this sanctuary is the Kameng River. Due to the large variety of bird species seen at the Eaglenest Wildlife Sanctuary, it is a famous Birding Sight for the visitors. The Eaglenest Wildlife Sanctuary is safeguarded from timber and animal poaching, mostly because it is isolated.
As this sanctuary has an unpaved road which allows access to the entire altitudinal range, it becomes easier for the military, scientists and eco-tourists to get here. As a major birding site, the Eaglenest Wildlife Sanctuary houses about 454 species of birds, some of the prominent ones being Cormorants, Black Stork, Oriental White Ibis, Ducks, Hawks, Nightjars, Vultures, Fairy-Bluebirds, Larks, Flycatchers, Kingfishers and so on.
Along with birds, Eaglenest Sanctuary is also the home of 15 species of mammals such as the endangered Capped Langur, Bengal Tiger, Asian Elephant, Red Panda, Asiatic Black Bear etc.
In addition, this wildlife sanctuary also has 34 different species of amphibians, 24 species of snakes and 7 species of lizards. Eaglenest also includes a few rare species such as the Darjeeling False-wolf snake and the Gunther's Kukri Snake.