. California ground squirrels : a bulletin dealing with life histories, habits and control of the ground squirrels of California / [by J. Grinnell, J, Dixon and others]. . Fig. 19. Plot of a used nesting burrow of the Oregon Ground Squirrel, as excavated by J. Grinnell and W. C. Jacobsen in a pasture near Macdoel, in Butte Valley, Siskiyou County, May 16, 1918. Main opening of burrow-system at a, with shallow, bean-shaped mound nearly two square yards in extent opposite. Greatest depth of earth in mound, 100 millimeters. Only other opening, at s, flush with surface, and without any out-pushed
. California ground squirrels : a bulletin dealing with life histories, habits and control of the ground squirrels of California / [by J. Grinnell, J, Dixon and others]. . Fig. 19. Plot of a used nesting burrow of the Oregon Ground Squirrel, as excavated by J. Grinnell and W. C. Jacobsen in a pasture near Macdoel, in Butte Valley, Siskiyou County, May 16, 1918. Main opening of burrow-system at a, with shallow, bean-shaped mound nearly two square yards in extent opposite. Greatest depth of earth in mound, 100 millimeters. Only other opening, at s, flush with surface, and without any out-pushed earth. Mouth of burrow at a, 100 millimeters wide by 90 high. Mouth of opening at s, 75 by 60. Dimensions of burrow at f, 75 by 60 mm.; at c, 90 by 65 ; at d, 60 by 60; at o, 60 by 60. Depth of burrow at b, beneath surface of ground, 300 mm.; at c, 350; at d, 200; at f, 300; at g, 520; at h, 590; at j, 750; at fc, 1,000 ; at o, 660 ; at p, 520 ; at r, 550. Branches at i, e and t came nearly to surface of ground. Old nest cavity at 7c, 300 mm. in diameter, and floored with a damp mixed mass of old frazzled grasses, excrement, and earth. At m and I, chambers, 770 and 1,110 mm., respectively, beneath surface of ground, packed full of a mixture of excremental pellets and loose earth. Blind terminal at n, 850 mm. deep. New nest, in use, containing many live fleas, at q; cavity of this, 190 mm. wide by 170 high, and 700 mm. beneath surface of ground, nearly filled with a dry clean hollow mass of shredded juniper bark and weathered grasses. The excavating was begun at a, and the female and six third-grown young were overtaken at s and t, where they were about to escape. Total length of this burrow system, 66 feet. Average diameter of burrow, 2J inches. Volumetric content of entire system, 3| cubic feet. Greatest depth reached, 45 inches, or nearly 4 feet. short-cylindrical or elliptical in shape, and measure millimeters in diameter by from 15 to 22 in length. There were two nest c
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Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookcollectionbiod, bookdecade1910, bookyear1918
