Abstract
A survey of Peregrines in the breeding season of 1991 gave an estimated total of 1283 pairs occupying known nesting territories in Britain and Northern Ireland. 1214 territories were found occupied, 53 by apparently single birds, and 141 known territories (9%) were not visited. Overall territory occupancy was 83%. The figure of 1283 pairs represents 147% of the overall population level believed to exist in 1930–¸39, and 167% of that counted during the previous national survey, in 1981. The net increase was geographically uneven, being greatest in a broad zone from the eastern Grampians to South Wales, whereas numbers were still well below pre-war level in coastal south-east England. In coastal and western inland areas of the northern Highlands, numbers have declined since 1981. Throughout the UK, many coastal populations have substantial proportions of territories occupied by nonbreeding birds. Population growth has involved both an increase in breeding density and expansion of breeding distribution, the ...
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