Boreal Red-backed Vole
Boreal red-backed vole, Clethrionomys gapperi
The boreal red-backed vole, also known as the southern red-backed vole, is an extant species of rodent that is currently found throughout Canada and the mountainous and extreme northern portions of the U.S. It had a more southerly distribution during the last ice age, and serves as an indicator of cooler temperatures during that time.
Red-backed Vole. By D. Gordon E. Robertson (Own work) [CC-BY-SA-3.0 (www.creativecommons.org/licenses/by-sa/3.0) or GFDL (www.gnu.org/copyleft/fdl.html)], via Wikimedia Commons.
Length: 12.7-15.2 cm (5-6 in)
Weight: 6-42 gm (0.21-1.48 oz)