. Proceedings of the Symposium on Management of Forest and Range Habitats for Nongame Birds, May 6-9, 1975, Tucson, Arizona. Birds Conservation Congresses; Birds Habitat Congresses; Range management Congresses; Wildlife habitat improvement Congresses. populations and finest arrays of breeding rap- tors In North America—and perhaps the world. The following number of breeding pairs—about five pairs per square mile—were found on the area in 1973: Species Breeding Pairs 14 Prairie Falcon 112 Red-tailed Hawk 27 Marsh Hawk 6 Kestrel (Sparrow Hawk) 17 Ferruginous Hawk 5 Great Horned Owl 9 Barn Owl 19
. Proceedings of the Symposium on Management of Forest and Range Habitats for Nongame Birds, May 6-9, 1975, Tucson, Arizona. Birds Conservation Congresses; Birds Habitat Congresses; Range management Congresses; Wildlife habitat improvement Congresses. populations and finest arrays of breeding rap- tors In North America—and perhaps the world. The following number of breeding pairs—about five pairs per square mile—were found on the area in 1973: Species Breeding Pairs 14 Prairie Falcon 112 Red-tailed Hawk 27 Marsh Hawk 6 Kestrel (Sparrow Hawk) 17 Ferruginous Hawk 5 Great Horned Owl 9 Barn Owl 19 Screech Owl 2 Burrowing Owl 2 Total 213 (Est.) The BLM is confident that studies of these birds now in progress will allow better land manage- ment to benefit endangered as well as abundant raptors in similar habitats throughout the world. The raptor management problems that these studies address have developed because of two major gaps in our knowledge of predatory birds: (a) most raptor research has been seasonal and short-term; and (b) studies of population dy- namics and food habits of raptors usually have not been conducted simultaneously with quantita- tive studies of prey population levels and other ecological considerations. A multifaceted, penetrating research effort must be made if quantitative data concerning population dyna- mics, ecological impact, management, and conservation are to be synthesized. During a five-year period, BLM Wildlife Biologists, and contracted private consultants and university personnel, will conduct at least seven closely coordinated studies. Titles and principal investigators () are listed below: I. Population Dynamics, Reproductive Biology, and Food Habits of Raptors. BLM Wildlife Biologists; Michael N. Kochert. II. Estimation of Raptor Tolerance to Human Disturbance. To Be Initiated FY 1976. III. Activity, Hunting Patterns, Territoriality, and Social Interactions of Birds of Prey. Western Illinois Univ.; Dr. Thomas C.
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