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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Departure of Swifts

01 January 1945
Comments Main paper THE arrival and departure of migrants are usually recorded by the dates upon which the first and last birds are seen. The arrival date of the first bird of any migrant species is usually fairly close to the arrival of the main bulk of that species : even ...
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Letters

01 November 1944
Comments Letters SIRS,--With reference to t h e note under this heading (antea, p. 53), I found a pair of Ravens breeding in a similar situation in mid-Wales during early April, 1929. The Raven's nest was situated in a tree about 30 yards from a rookery of eighteen nests....
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