. The Canadian field-naturalist. Figure 2. Locations of Red-tailed 1979-1982. Hawk nests from heights ranged from 12 to 38 m, with the average 25 m. Cottonwoods were the tallest species used. Densities The numbers of active nests in 1983 to 1985 were 12, 12 and 15, respectively. The average density was 13 nests per km^ or one nest per km^. This density was fairly uniform except in the southeast corner (see Figures 2-5). Until 1984, nests were distributed more densely in this area. Two 1983 nests, located near the river, were within 200 m of each other. Discussion Red-tailed Hawk nesti
. The Canadian field-naturalist. Figure 2. Locations of Red-tailed 1979-1982. Hawk nests from heights ranged from 12 to 38 m, with the average 25 m. Cottonwoods were the tallest species used. Densities The numbers of active nests in 1983 to 1985 were 12, 12 and 15, respectively. The average density was 13 nests per km^ or one nest per km^. This density was fairly uniform except in the southeast corner (see Figures 2-5). Until 1984, nests were distributed more densely in this area. Two 1983 nests, located near the river, were within 200 m of each other. Discussion Red-tailed Hawk nesting densities range from one pair or nest per km^ to one per 37 km^, averaging one nest per km^ (Mclnvaille and Keith 1974; Gates 1972; Luttich et al. 1971; Hagar 1957; Orians and Kuhlman 1956; Craighead and Craighead 1956;. Figure 3. Locations of Red-tailed Hawk nests in Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Ottawa Field-Naturalists' Club. Ottawa, Ottawa Field-Naturalists' Club
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