Tibetan Snow Cock
One of the interesting attributes of birds of the Himalayas is that birds fly to exceptional altitudes. Mountain climber’s often reported that birds such as choughs, bearded vulture (lammergeirts), ravens, and eagles can soar up to an elevation of 7,625 meter/25,000 ft.; while some birds fly even higher. Seemingly birds acclimatize readily to low oxygen pressures and can adjust without adaptation to elevation that would rapidly reduce a person’s unconscious. (Fleming, Birds of Nepal, 1984)