![]() ![]() ![]() Populations nesting in northern latitudes are highly migratory those nesting in northern maritime climates, at mid-latitudes, and in the Southern Hemisphere much less so (Cade 1982). In Utah, home range radii varied from 0.3 to 29.8 kilometers, average 12.2 km (n = 19 Porter and White 1973). 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). Severe weather may result in high mortality in far north. Great-horned Owl may be a serious nest predator in the U.S. In northwestern Arizona, mean distance between centers of nesting areas was around 6-8 km (Brown et al. See many further details in Palmer (1988). Brood losses apparently caused mainly by bad weather. Replaces lost clutches, usually at alternate site. First breeds usually at 2-3 years, occasionally as yearling. Young fledge at 39-49 days, gradually become independent. Incubation lasts 32-35 days, mainly by female (male brings food). Ī falcon with long pointed wings, a dark crown and nape, and a dark wedge extending below the eye forehead is pale in immature, which are mainly brownish above rather than black or gray as in adults arctic birds are relatively pale, and peregrines of the northwest coast of North America are very dark, compared to the intermediate coloration of the subspecies ( anatum) that once ranged across North America averages 41-51 cm long, 91-112 cm in wingspan (NGS 1983).Ĭlutch size averages 4 at mid-latitudes, 3 in far north. American Ornithologists' Union, Washington, D.C. BC Conservation Data Centre: Species SummaryĪmerican Ornithologists' Union (AOU). ![]()
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