It is well known that owls (Strigiformes) and diurnal raptors (Falconiformes) sometimes prey on one another, but the records have been scattered through the literature. Arising out of a study of the prey of certain owls, particularly Great Grey, Ural, Eagle and Hawk in Fenno-Scandia (Mikkola 1970, 1972, etc.), I have checked all the publications available to me on the foods of birds of prey i


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