Great-horned Owl may be a serious nest predator in the U.S. Severe weather may result in high mortality in far north. Foraging range up to 27 kilometers (Martin 1979); home ranges in Great Britain varied from 44-65 square kilometers, and averaged 52 square kilometers (Brown and Amadon 1968). In Utah, home range radii varied from 0.3 to 29.8 kilometers, average 12.2 km (n = 19; Porter and White 1973).
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