THE quantitative aspects of the reproduction of the Swallow (Hirundo r. rustica) have been intensively studied in the enquiries of the British Trust for Ornithology (antea, Vol. XXIX, pp. 3-21, Vol. XXX, pp. 98-116) and in many other surveys; but there remains a curious gap in our knowledge of the breeding behaviour. Very little has been recorded of sexual displays. In the summers of 1939 and 1940...
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