Rajaji National Park is one of richest in forest of its avifauna. It has 11 species of woodpeckers, 5 species of barbets and 3 species of hornbills including the near threatened Great Pied Hornbill. Under the Western Himalayas Endemic Bird Area, Stattersfield et al. (1998) have listed Brooks’s Leaf – warbler Phylloscopus subviridis and Tytler’s Leaf- warbler Phylloscopus tytleri as restricted rang species. Both species are winter migrants to the Park.
A total of 312 birds species has been recorded. Of these , 151 are residents, 87 migrants, and 49 are altitudinal migrants, 7 are local migrants, while the status of the remaining 18 is unknown. For some species, Rajaji forms the western edge of their range, e.g. Great Pied Hornbill Buceros bicornis and Golden – fronted Leafbird Chloropsis aurifrons.