Wide altitudinal variation supports a very large segment of avian fauna to inhibit in this forest range.

Few small hamlets are there inside and around the periphery of this sanctuary; which are namely Barapathar, Kilbury, Vinayak etc.

Inside this wildlife sanctuary, the primary ecoregions are: All of these are typical of the Nepal - India hilly region.

[1] Birds at Naina Devi Himalayan Bird Conservation Reserve include species like the hill partridge, chukar partridge, koklass pheasant, kalij pheasant, goldcrest, rufous sibia, red-billed leiothrix, black-chinned babbler, chestnut-bellied nuthatch, black-throated tit, rock bunting, green-tailed sunbird and yellow-breasted greenfinch.

Some very commonly seen mammals in this wildlife sanctuary are several types of bats and Royle's pika of the family Ochotonidae.