Rufous-necked Hornbill is another of the Park's specialities. Eaglenest still holds a healthy population of the species.
The species has a wide range, currently known from Bhutan, north-east India, Myanmar, southern Yunnan and south-east Tibet, China, Thailand, Laos and Vietnam. It has declined dramatically and is now very rare across much of its historical range. It is thought to be extinct in Nepal, and the species probably faces extinction in Vietnam. The most healthy populations are found nowadays in Bhutan and the vast hill forest tracts in Arunachal Pradesh, such as Eaglnest Wildlife Sanctuary and Namdapha National Park. Population densities in these strongholds have led some to suppose that the species is more widespread and common than field surveys suggest. The species is perhaps also still locally common in north Myanmar.
As a large cavity breerder, the species depends on very big forest trees, which are mainly found the in primary forestst within it's range. It is considered as a god indicator species of large primary forests. Bacause of the large declines of the species, mainly due to habitat loss, it is now listed by IUCN as Vulenarable.