Abstract
Microtus pennsylvanicus usually seems to be most abundant in the heaviest grassy cover of an area. Eadie (Jour. Mamm., 34: 263–264, 1953), reported on relative vole abundance in a quarter-acre quadrat of an uncut timothy field. He found that the area of high mouse numbers as measured by bait acceptance “… had almost twice as much vegetative cover as the area of low acceptance.” To measure cover he air dried and weighed all vegetation taken from small random plots in the “high” and “low” areas.

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