That came as news to me. Some fly at 11200m/37,000 feet. https://en.m.wikipedia.org/wiki/List_of_birds_by_flight_heights https://en.m.wikipedia.org/wiki/List_o

That came as news to me. Some fly at 11200m/37,000 feet. https://en.m.wikipedia.org/wiki/List_of_birds_by_flight_heights https://en.m.wikipedia.org/wiki/List_of_birds_by_flight_heig...