The aerial dawn chorus of the Swallow
01 April 1951
Main paper
(i) Over a number of years one of us (A. V. B.), has ringed migrants at Jupille, near Liege, between Aug. 20th and Sep. 15th, always arriving at the trap before dawn. W h e n the weather is fine, with a cloudless sky and little or no wind, a song-chorus o...
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