Murie, J. & Michener, G. The Biology of Ground-Dwelling Squirrels. Annual Cycles, Behavioural Ecology, and Sociality. 1st. Pub. Univ. of Nebraska. 1984
pp.xvi, 459 with text figs. & graphs. Fine copy.
These animals are unique among the smaller mammals of the Nearctic in that they are strictly diurnal, large enough to be readily visable, and often present in open habitats. Most species are obligate hibernators.
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