“…. Bird diversity research in this area has revealed that the eastern Himalaya mountain range, south slopes, and mid-lower altitude areas have higher levels of bird diversity than the western Himalaya mountain range, north slopes, and high-altitude areas, respectively (Acharya et al , 2011Price et al 2011;Wang et al 2013;Romanov et al 2016). In addition, the adaptability of birds to high-altitude areas, such as the enhancement of the oxygen transport capacity of the Barheaded Goose (Meir & Milsom 2013) and changes in the flight characteristics of vultures (Sherub et al 2016) have also been investigated.…”