Nestled among the Dafla Hills of the eastern Himalayas, Eagle's Nest Sanctuary covers 218 sq km and has an altitude that ranges between 500m and 3500m. This sanctuary is a protected area that has become well-known as a major birding spot. Supporting over 400 species of birds including 4 types of Hornbill species, 3 different types of Tragopan species; 6 types of Parrotbill species (such as Rufous-headed Parrotbill), and 15 species of mammals including Royal Bengal Tiger, Asiatic Elephant, and Red Panda, this sanctuary is a must-do on any keen wildlife and birding enthusiast's itinerary.

Eagle's Nest Sanctuary is also the site where Bugun Liocichla was first discovered in 1995 and again observed and described in 2006 by Ramana Athreya.