Show Av Aviators Meet Few Birds Flying Above An Altitude of Five Thousand Feet How high do birds fly in their seasonal seasonal sea sea- sana journey Actual evidence above the earth is still scanty and only since rince the development of the airplane have definite altitudinal observations ob ob- ob become available writes Eleanor Allen in the Portland Ore- Ore gonian Earlier observers maintained maintained maintained main main- that most normal migrations took place at heights above feet They attempted to justify their theory by an uncertain in belief that flying became easier as altitude was gained Aviators however are opposed op Ope posed to that theory as it is found that with greater altitude there is increasing difficulty In maintaining speed and height From a considerable number of records based on the experiences of airmen it has been found that it is exceptional in flying to meet with birds above an altitude of feet and that the bulk of migration is performed below a height of feet from the earth Birds occasionally fly at great heights Dr A. A F. F R. R Wollaston when on th the Mount Everest expedition in 1921 1021 recorded godwits and curlews at feet It also has been recorded recorded re reo corded that an observer making photographic photographic pho pho- observations of at the sun at Dehra in India obtained a photograph photograph photograph photo photo- graph of geese estimated flying at an altitude of feet Although it has been definitely established established es es- that the birds follow certain certain tam tain routes on n their journeys to and from breeding grounds and winter homes it is not generally understood that these routes are followed by the tha same groups of individual birds bird during during durIng dur dur- ing successive years This fact has been determined by the banding method carried on by the biological biological biological ical survey |