. Brigham Young University science bulletin. Biology -- Periodicals. Biological Series, Vol. 18, No. 1 Peregrine Falcon in Utah 33. Fig. 26. A cliff along the escarpment of the Wasatch Mountains which contained eyries of both the Peregrine Fal- con and tlie Prairie Falcon (Table 1. site 7). The Peregrine Falcons used site A-3 in , 1952, and 1953; site B in 1946 and 1947; and site C in 1948 and 1951. The Prairie Falcons used site 2 in 1948; site A-3, 1949; and site 1, to the north (not shown in photograph) of site A-3, in 1943 and 1950. Sites B and C faced south, sites 1, 2, and A-3 faced
. Brigham Young University science bulletin. Biology -- Periodicals. Biological Series, Vol. 18, No. 1 Peregrine Falcon in Utah 33. Fig. 26. A cliff along the escarpment of the Wasatch Mountains which contained eyries of both the Peregrine Fal- con and tlie Prairie Falcon (Table 1. site 7). The Peregrine Falcons used site A-3 in , 1952, and 1953; site B in 1946 and 1947; and site C in 1948 and 1951. The Prairie Falcons used site 2 in 1948; site A-3, 1949; and site 1, to the north (not shown in photograph) of site A-3, in 1943 and 1950. Sites B and C faced south, sites 1, 2, and A-3 faced west. Photo by R. J. Envin, 1972. ledge, which contained two nest scrapes, but apparently laid no eggs. They defended several sites on the cliff in 1950 but with less tenacity than usual. Although they made 20 to 25 scrapes along several hundred feet of ledge, no eggs were found. Between 4 March and early June the cliffs were searched for an eyrie 10 times without success. The behavior of the birds sug- gested the presence of a nest at numerous places along the cliff. However, each new section of chff was defended with nearly equal spirit. In 1952, the two young at site A (Fig. 26 and Tables 7 and 8) were measured and weighed from date of hatching until 13 August. They were removed from the nest on 5 July. R. J. Erwin banded three young peregrines at the site in 1953. He obtained no informa- tion on egg number or occurrence of Prairie Falcons. A new female peregrine nested at alternate site A in 1952. She still had some immature ,0^' •t V Fig. 27. Five-egg clutch of Peregrine Falcon (eyrie site 7-B, Table 1, 1947). Note the wood rat {Neo- toma sp.) scat on ledge and about the eggs. Photo by R. D. 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 Brigham Young University. Provo, Utah : Brigham
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