Yosemite nature notes . From Kodtchrome by AmdtTtou From Koitrbromi by Andersm. Pencil indicates check pouch of pocket gopher. Forefoot of pocket gopher is fine for digging MAMMALS OF YOSEMITE NATIONAL PARK 73. Photo by Author tbolo by Author Pocket gopher hole showing eccentric dirt pile. Pocket gopher mound. Note that it is lopsided. Pocket gophers make long series oftunnels about half a foot below the sur-face, with dirt piles thrown up at dif-ferent spots above them. These are mainlyexploratory tunnels, thrown out in searchof food which consists of almost anyvegetable material, roots, stem

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• Dimensions: 2650 x 943 px | 22.4 x 8 cm | 8.8 x 3.1 inches | 300dpi

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Yosemite nature notes . From Kodtchrome by AmdtTtou From Koitrbromi by Andersm. Pencil indicates check pouch of pocket gopher. Forefoot of pocket gopher is fine for digging MAMMALS OF YOSEMITE NATIONAL PARK 73. Photo by Author tbolo by Author Pocket gopher hole showing eccentric dirt pile. Pocket gopher mound. Note that it is lopsided. Pocket gophers make long series oftunnels about half a foot below the sur-face, with dirt piles thrown up at dif-ferent spots above them. These are mainlyexploratory tunnels, thrown out in searchof food which consists of almost anyvegetable material, roots, stems and all.Occasionally a side vent will be put upto the surface so the animal may foragenear by, but never far from the safetyof his £ubway. Often a lower level oftunnels contains nesting and storagechambers. In wilderness country like YosemiteNational Park, pocket gophers have longplayed an important part in the develop-ment of the soil. They bring up a veryrespectable amount of earth from below—in one area, 1.64 pounds per squareyard, according to Grinnell and Storer.Thus the weathering of the subsoil ishastened by its being deposited on thesurface. The extensive tunnels permitaeration and the intr