Compared with other birds of prey, such as the Peregrine Falco peregrinus and the Red Kite Milvus rnilvus, relatively little work has been carried out on the distribution of the Merlin F. columbarius in Wales. During the past two decades, this is also the case in the rest of Britain, except for two important papers. The earlier of these examined evidence for reproductive failure of British Merlins

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