. Brigham Young University science bulletin. Biology -- Periodicals. BiOLOcic.\L Series, Vol. 18, No. 1 Peregrine F.\lcon in Utah 59 Table 11. Size of area available for nesting at Prairie and Peregrine Falcon eyrie sites in ; Types of sites and PRAIRIE FALCONS PEREGRINE FALCONS units of measure n X range n X range POTHOLE SITES Avail, nest, area sq feet 5 - â â â sq meters 5 - â â â N'olume of potholes cubic feet 4 - â â â â cubic meters 4 - - â â â LEDGE AND POTHOLE SITES, combined sq feet sq meters 8= 7' 1
. Brigham Young University science bulletin. Biology -- Periodicals. BiOLOcic.\L Series, Vol. 18, No. 1 Peregrine F.\lcon in Utah 59 Table 11. Size of area available for nesting at Prairie and Peregrine Falcon eyrie sites in ; Types of sites and PRAIRIE FALCONS PEREGRINE FALCONS units of measure n X range n X range POTHOLE SITES Avail, nest, area sq feet 5 - â â â sq meters 5 - â â â N'olume of potholes cubic feet 4 - â â â â cubic meters 4 - - â â â LEDGE AND POTHOLE SITES, combined sq feet sq meters 8= 7' 8' - 7' kI R, J Envii 'Data were collected between 1943 and 1972 by R. D. Porter, C .M While peregrine eyrie site 7. ^Two of the eyrie sites were alternate sites at site 7 (Table 1); one was used in common with peregrines. ^Data are from toiu different eyrie sites, including tliree alternate eyrie sites at site 7 (Table 1. figs. 2(i-VI 8 for nuiie detailed data on and possibly not suitable for peregrines, could be used, thus giving additional pairs of Prairie Falcons the opportunity to nest. Prairie Falcons nesting in the more arid desert areas of Utah frequentlv use sites which probably would not be used b\' the peregrine. Aggressive Interactions between Peregrines and Prairie Falcons Nelson's (1969) reported decline in active peregrine eyries around the Great Salt Lake probably involved the use by Prairie Falcons of abandoned peregrine evries (Nelson, pers. comm., 1971), and as mentioned earlier, the peregrine also is known to have occupied an eyrie which earlier in the ccntur\ was used by Prairie Fal- cons (see White, 1969b). No direct competition between the two spe- cies for nt>sting sitt^ was recorded during the \ears that the earlier mentioned Wasatch Moun- tain evries (Table 1, site 7) were under observa- tion by Porter and Erwin, despite the fact that the e\'rie sites were only about 300 feet (91 111) apart (Fig
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