The 12 species are: Sorex cinereus, Sorex palustris, Sorex vagrans, Ochotona princeps, Lepus americanus, Marmota flaviventris, Spermophilus lateralis, clethrionomys gapperi, Phenacomys intermedius, Microtus longicaudus, Microtus montanus, and Zapus princeps.
"Mammals of the Grand Mesa, Colorado"
Sydney Anderson
These runways were used also by clethrionomys and other small animals.
"Mammals taken Along the Alaska Highway"
Rollin H. Baker