C.B.Davis 1935 429 Kaufman Clark Co., Idaho, June 27, before. There I hunted for about two hours and succeeded in killing 9 of them. All saved. I believe these are typical of what C. pessimus is. The squirrels were living in a high portion of a field that bordered on the right-of-way of the R.R. tracks. The field was too high to water easily and was not under cultivation, being overgrown with "Russian Thistle." This plant was used extensively by these squirrels both for cover and as food. In an old ditch that had blown full of these weeds—"fleer," called tumble weeds locally—there were dozens of burrows, these running parallel with the ditch bank usually for about 10 or more feet and having several entrances ranged along in tandem fashion. The squirrels were also burrowing into the R.R. bed and occasionally they had burrowed into flat ground. This last was the exception. Raised ground or ditch banks were favored.