The 1975 National Survey of Rookeries |
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| Authors: | B. L. Sage J. D. R. Vernon |
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| Affiliation: | 1. 13 Dugdale Hill Lane, Potters Bar , Hertfordshire , EN6 2DP;2. 55 Wolfridge Ride, Alveston , Bristol , BS12 2PR |
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| Abstract: | Comparisons of national Rook censuses in 1944–46 and 1975, and various local surveys between these dates, showed that the British Rook population increased steadily up to the 1950s or (in some areas) to the early 1960s, but declined seriously thereafter. In 1975, 94% coverage of the United Kingdom produced counts totalling 907,717 nests. |
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