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RULE 2 PERMITS <br /> rodents/acre, and grid 2 produced an average of 20 rodents/acre. Trapping success for grids 1 and <br /> 2 were 30%and 23%, respectively. <br /> Total numbers of rodents captured and density per acre were higher in the fall than in the spring. <br /> This is a function of post-reproduction versus pre-reproduction numbers. <br /> Data from the trapping transects located adjacent to the browse transects was collected only to <br /> determine rodent species diversity within the habitat types. Table 2.04.11-9, Rodent <br /> Species/Habitat Type, shows the habitat types and the species captured. <br /> The U.S. Fish and Wildlife Service also conducted a nine day small mammal sampling program <br /> in 1975. Five traps were used on a 5-acre grid in a mark-recapture effort for six days. After the 6th <br /> day, a transect line (20 stations, 3 traps per station)was used to sample the area for three days and <br /> nights. Results of the small mammal sampling are shown in Table 2.04.11-10, USFWS - Small <br /> Mammal Transects. Additional information concerning the USFWS sampling program is found in <br /> Exhibit 11, Wildlife Information. <br /> Data collected for 1975 and 1976 show that, (1) rodent densities on the site were high compared <br /> to those of other areas of the west; (2) total numbers of rodents were affected by condition of the <br /> habitat; (3) habitat type also affected the diversity and numbers of rodents; and d(4) rodents were <br /> not drastically affected by cover removal of the habitat improvement areas. <br /> Lagomorphs <br /> When the pre-mining wildlife studies began in 1974, Lagomorph numbers were extremely low. <br /> The CPW estimated jackrabbit densities at 4.0 animals/square mile and cottontail densities at about <br /> 10.0 animals/square mile in 1974. Observations from 1974-1979 showed a stead increase in <br /> numbers with a peak probably occurring in 1979. Cyclic population fluctuations of these two <br /> species is a common occurrence which makes it difficult to accurately estimate numbers. <br /> Relative abundance,presence, and probably habitat of Lagomorphs are set forth in Table 2.04.11- <br /> 11, Wildlife Species that Occur or are Likely to Occur in the Colowyo Permit Area. <br /> Avifauna <br /> Species of birds that occur or are likely to occur in the permit area and the habitat where the species <br /> is likely to occur are listed in Table 2.04.11-11, Wildlife Species That Occur Or Are Likely To <br /> Occur In The Colowyo Permit Area. All species that were observed during field surveys are noted <br /> on the list. <br /> Raptors <br /> Surveys were conducted by VTN personnel during baseline data collection in 1974-1977, and <br /> again by Colowyo personnel during the spring and summer of 1980. The most common raptors <br /> observed on the permit area from 1974 to the present include Red-tail Hawks, Marsh Hawks, <br /> American Kest , " eat Horned Owls, Golden Eagles, Prairie Falcons, and Turkey Vultures, all <br /> Rule 2 Permits 2.04-64 Revision Date: 12/20/19 <br /> Revision No.: TR-135 <br />