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| | The Colorado River as a Highway of Dispersal... by Joseph Grinnell |
 | | In the case of the two diurnal chipmunks, Ammospermophilus harrisi harrisi and Ammospermophilus leucurus leucurus, which could be seen, it was seldom that an individual was come upon more than fifty yards from its burrow. |
| | In the case of Perognathus, which carefully closes the mouths of its burrows for the day, after its night's activity abroad, it was impossible to secure definite information on this score except as afforded by trapping; but the writer's impression is that it, too, does not ordinarily venture many rods from its retreat. |
| | All the mammals of the Encelia association, as segregated here on the two sides of the river, were trapped at this station within one thousand feet of one another. |
| www.wku.edu /~smithch/biogeog/GRIN1914.htm (4584 words) |
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