The dispersion of the Buzzard Buteo buteo in Europe and of the closely related Red-tailed Hawk B. jamaicensis in North America is almost identical in different parts of their respective ranges. In winter, they may be wholly migratory, as in northern Scandinavia (Olsson 1958) and Alberta (Mclnvaille & Keith 1974), or they may be partly migratory, as in West Germany (Mebs 1964) and Michigan

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