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humane society. He is currently professionally studying raptors under <br />a grant from the U. S. Forest Service. He also spent four and one-half <br />years with the Division of Birds at the Smithsonian Institution. <br />Dr. Wirtz made four positive identifications of peregrine falcons flying <br />overhead on the Logan Wash site during 1974 and 1975. In his professional <br />opinion he has quite reasonably established the presence of a nest site <br />on Occidental property through behavior patterns of the falcons. <br />Dr. Wirtz, at our request, then made a literature search on "potential <br />disturbance of peregrine falcon at or near nest sites". Several signi- <br />ficant points were gleaned from his search: <br />1). Human harassment in the form of disturbance at eyries (nest sites) <br />is a serious factor in some situations, particularly in parts of the West <br />• as reported by Snow (1972), a P.esearch Biologist at the Conservation <br />Library at Denver, Colorado. <br />2). Successful eyries may have to be at least one-half mile from the <br />nearest human habitation, unless the cliff is particularly high and <br />precipitous (Hickey and Anderson, 1969). <br />3). A definite possibility for habitat management is the restriction of <br />activities around known eyries during the breeding and nesting season as <br />suggested by Snow. <br />The location of the suspected eyrie is more than two miles from the site <br />of Occidental's Dry Gulch Mineral Waste Disposal Area and in another gulch. <br />• In a personal conversation between Dr. Wirtz and Dr. T. J. Cade of Cornell <br />University, Dr. Cade, an authority on peregrine falcons, noted that the <br />-8- <br />