Collared Lemming

Collared lemming, Dicrostonyx sp.

Three species of collared lemming have been identified in North America, the nearctic collared lemming (Dicrostonyx groenlandicus), the Ungava collared lemming (Dicrostonyx hudsonius), and Richardson's collared lemming (Dicrostonyx richardsoni). However, these species can be difficult to distinguish on the basis of isolated teeth and only D. richardsoni has been identified through aDNA (Fulton et al. 2013). For that reason, the unspecified genus, Dicrostonyx, is discussed here. 

Greenland collared lemming

Greenland collared lemming. Photo by Kevin Pietrzak, and used under the Creative Commons License. 

Rodentia (Rodents)
Cricetidae (Lemmings and Voles)

Length: 13-16 cm (5.1-6.3 in)

Weight: 45-113 g (1.6-4.0 oz)