Abstract Over 1,000 Merlin Falco columbarius nest records were analysed following a national survey in Britain in 1993-94. The broad-scale principal habitat, altitude and nest-site were assessed in relation to clutch size, successful brood size and productivity for 13 study areas. The majority of breeding areas (87.5%) were found in five moorland types (dry heather moor, mixed wet-dry heather moor...

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