THE TRACK OF BIRDS
Migrating birds fly in the sub-strato-phere, according to observations made during the past ten years by members of the staff of Pan-American Airways. Pilots have reported seeing birds at all heights, up to the limits at which they have been operating. Meanwhile, it has been found impossible to obtain any report from an obI server on board ship in mid-ocean tes- ! tifying to his having seen any lai-ge flock of birds from the deck. The conclusion suggested is that the sub-stra-tosphere is used. Other points made by these Pan-American observers are concerned with speed. Using instruments originally designed for anti-air-craft defence, observers have estimated the speed of certain birds. The fastest speed recorded was 110 m.p.h. by the lammergeier, a bird of prey resembling both the eagle and the vulture and found between Spain and India. Next came the swallow, with 106 m.p.h. ,
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Bibliographic details
Evening Post, Volume CXXVIII, Issue 5, 6 July 1939, Page 5
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147THE TRACK OF BIRDS Evening Post, Volume CXXVIII, Issue 5, 6 July 1939, Page 5
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