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• and previous paths of the light beam were retraced . Any <br /> eyeshine observed was investigated to identify the animal <br /> species of origin. The night spotlight survey was started <br /> in a different portion of the prairie dog towns searched <br /> each night so that the times each was searched varied from <br /> night—to—night . Survey routes were also run backwards at <br /> some point during the survey to vary the direction of travel <br /> through the search areas . <br /> Each prairie dog town was searched a minimum of three <br /> times during each night survey. The distribution and density <br /> of shrubs within the towns were such that ground visibility <br /> was excellent . Observations and other pertinent <br /> • information (e .g . . weather conditions , time of survey, etc . ) <br /> were recorded on standard data sheets . <br /> Immediately after each night of spotlighting, the <br /> biologists searched for possible ferret sign (fresh digging, <br /> scats , skeletal material of ferrets, prairie dog skulls <br /> that had been chewed or punctured near the base, etc . ) <br /> while walking through each town and examining mounds and <br /> burrow entrances . Pertinent observations were recorded in <br /> the general comments section of the previous night ' s survey <br /> form. <br /> • <br />