A study of Swift weights

01 September 1971
Comments Main paper N E A R L Y A L L OF 2,546 Swifts Apus apus caught at Rye Meads Sewage Purification Works, Hertfordshire, in the late spring and summer of 1962 (845) and 1963 (1,701) were weighed and examined before being ringed and released. The pattern of the weights w...
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