Mystery photographs

01 May 1992
Comments Main paper The March mystery photographs (plates 52 & 53, both repeated here) show an elongated yet strong-looking passerine with a substantial, bi-coloured bill, very large feet, long undertail-coverts and a long tail. Its plumage is rather nondescript: unma...
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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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