. Brigham Young University science bulletin. Biology -- Periodicals. Sehien, N'ol. IS. No. .'3 Bueedinc :w R.\ptoks showed \irtuallv 100 per cent o\'erlap with some pairs of Ferruginous Hawks and Red-tailed Hawks, and in one year with Swainson's Hawks also. However, the actual nest site of each of these diurnal raptors w as relatively far removed from nest sites of other species, and their flight patterns indicated a form of altitudinal terri- toriality which pemiitted movement to their more commonly utilized hunting areas. Home range overlaps between Great Horn
. Brigham Young University science bulletin. Biology -- Periodicals. Sehien, N'ol. IS. No. .'3 Bueedinc :w R.\ptoks showed \irtuallv 100 per cent o\'erlap with some pairs of Ferruginous Hawks and Red-tailed Hawks, and in one year with Swainson's Hawks also. However, the actual nest site of each of these diurnal raptors w as relatively far removed from nest sites of other species, and their flight patterns indicated a form of altitudinal terri- toriality which pemiitted movement to their more commonly utilized hunting areas. Home range overlaps between Great Horned Owls and other raptors were common and often extensive. In addition, their average distances to nearest interspecific neighbors were the low- est of any of the large raptors on the study area. That this is a reflection of their acti\ity patterns is indicated by the aggressiveness with which other raptors react to their presence when flushed. Ob\iously then, Great Horned Owls are able to take advantage of a large portion of the total habitat available compared to the diurnal Buteos because of the direct absence of interspecific territorial competition, although their populations are smaller than those of the Ferruginous Hawk. Most of the smaller raptore on the study area nested within the home ranges of one or more of the larger raptors and occasionally, as pre- viously noted, were pre\ ed upon by them. Home ranges of these smaller raptors seldom over- lapped between two species of comparable size, , the Sparrow Hawk and Burrowing Owl, but much variation occurred in other cases. Bur- rowing Owls displaced the greatest interspecific tolerances, but their differing activity patterns contributed to the allowance of their observed home range overlaps with Marsh Hawks. Simi- larly, the close nesting and high degree of over- lap between Marsh Hawk and Short-eared Owl home ranges can also be attril)uted to dif- fering activity patterns which pre\ented direct confrontation betwee
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