So FAR AS I know, the first time that radar echoes were definitely identified as coming from birds was in the spring of 1940, when an experimental equipment on a wavelength of 50 cm. at Christchurch, Hampshire, detected gulls (Larus spp.) (Shire, 1958). Unidentified echoes, some of them doubtless from large birds, were reported on 150 cm. equipment round the British coasts during the ensuing year,...

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