File:Control of injurious rodents in California (1933) (20665850916).jpg

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Title: Control of injurious rodents in California
Identifier: controlofinjurio79stor (find matches)
Year: 1933 (1930s)
Authors: Storer, Tracy I. (Tracy Irwin), 1889-1973
Subjects: Rodents; Mammals; Zoology, Economic
Publisher: Berkeley, Calif. : College of Agriculture, University of California
Contributing Library: University of California, Davis Libraries
Digitizing Sponsor: University of California, Davis Libraries

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1933) Control op Injurious Rodents fruit trees such as almonds, apricots, and peaches. The Oregon ground squirrel practically never climbs. Ground squirrels are ^'fair-weather animals," active by day in the warmer season of the year and on the occasional warm days in winter. The young are brought forth in the season of plentiful food. Part of the population in the lowlands spends a period from late summer to mid- 6 6 /O /;i H /6 m ;?0 Zl Z4 /?^ ^g 30 32 3^ 36 dd -40 4Z 44 46 46 ^0
Text Appearing After Image:
rig. 1.—Plan and section of "colonial" burrow system of California ground squirrel: In, entrance; a, food store; nests as indicated. Each square is 2 feet. Exca- vated near Bakersfield, May 3, 1918, by Joseph Dixon and H. G. White. (From Grinnell and Dixon, 1919.) winter in "summer hibernation" or estivation (as detailed beyond), in contrast to those digger squirrels living in the mountains and all the Oregon ground squirrel population which regularly hibernate in the colder season of the year. Burrows.—All species of ground squirrels dig burrows, which are used for safety retreats, for shelter during inclement weather, and during estivation or hibernation, for the storage of food, and for the rearing of young. Burrows are made in flat land, in hillsides, and in ditch, road, and railroad embankments. These burrows vary in length, depth, and complexity. The diameter depends upon the species of squirrel. Dixon found that the burrows of the California ground squirrel averaged 4.3 inches in diameter, and that there were three kinds of bur- rows, "male," "female," and "colonial," the last being longest and most complex with numerous openings (fig. 1). The individual burrows were from 5 to 34 feet in length (including all side branches), while one

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Volume
InfoField
E79
Flickr tags
InfoField
  • bookid:controlofinjurio79stor
  • bookyear:1933
  • bookdecade:1930
  • bookcentury:1900
  • bookauthor:Storer_Tracy_I_Tracy_Irwin_1889_1973
  • booksubject:Rodents
  • booksubject:Mammals
  • booksubject:Zoology_Economic
  • bookpublisher:Berkeley_Calif_College_of_Agriculture_University_of_California
  • bookcontributor:University_of_California_Davis_Libraries
  • booksponsor:University_of_California_Davis_Libraries
  • bookleafnumber:9
  • bookcollection:californiaagriculturalexperimentstationpublications
  • bookcollection:ucdavis
  • bookcollection:americana
  • BHL Collection
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19 August 2015
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