Eaglenest Wild life Sanctuary covering an area of 217 sq. km and adjoins Seesa Orchid Sanctuary (100 sq. km) were notified as protected areas in 1989. The varied altitude range extremely from 300 meters to 3250 meters make it's paradise for nature enthusiast. Eaglenest is one of the wildness where place still discovering new species of birds, Herpetofauna and even mammals.

Altitude:  300 m to 3250 msl

Temperature:  -0˚ to 28˚C

Rainfall:  1,500 to 3,000 mm

Vegetation:  lowland evergreen forest, Tropical wet evergreen, broad-leaved forest, bamboo, conifers, roadside scrub and farmland, Montane wet temperate forest, Sub-alpine forest.

Best time to visit: November to May and for Butterflies

           For herpetofauna: May to October

Inside the park: trekking and vehicle following behind maintaining a proper distance would be the best.

Key species:

Mammals:  Royal Bengal tiger, Asian Elephant, Asiatic Black Bear, Red Panda, Assamese Macaque, Arunachal Macaque Discovered in 2004, Gaur etc.

 Birds: Eaglenest is well known for its bird's life, a birdwatcher's paradise par excellence.  A total of more than 450 species of birds have been recorded as far from this entire area. The worth mentioned are as follows.

Vulnerable: Beautiful Nuthatch, Rufous-nacked Hornbill, Blyth's Trogopan, Marsh Babbler etc.

Near threatened: Satyr Trogopan, Ward's Trogopan, Great Hornbill.

Endemic to this area: Blyth's Trogopan, Ward's Trogon, Rusty-bellied Shortwing, Hoary-throated Barwing etc.

Apart from these Eaglenest is home of 6 wren-babblers (wedge-billed, bar-winged, pygmy, spotted, rufous-throated and scaly-breasted), 6 tit-babblers/fulvettas (incl. golden-breasted, brown-throated, and yellow-throated), 3 sibias (incl. beautiful, and rufous-backed), 5 yuhinas (incl. black-chinned, rufous-vented and white-naped),  fire-tailed myzornis, 6 parrotbills (greater and lesser rufous-headed, brown, grey-headed and fulvous-fronted), mountain tailorbird, 3 tesias (chestnut-headed, grey-bellied and slaty-bellied), 8 flycatcher-warblers (incl. broad-billed, white-spectacled, chestnut-crowned and black-faced), 4 niltavas (incl. vivid and large),  13 flycatchers (incl. white-gorgeted), rufous-bellied and grey-crested tits,  sultan tit, beautiful nuthatch, wallcreeper, brown-throated treecreeper, yellow-bellied flowerpecker, mrs gould's and fire-tailed sunbird, gold-naped black-finch, beavan's bullfinch, brown bullfinch, common hill-partridge, temminck's tragopan, ashy wood-pigeon, tawny wood-owl etc