Attributes / relations provided by
♦ 1DIETS OF NORTHERN PYGMY-OWLS AND NORTHERN SAW-WHET OWLS IN
WEST-CENTRAL MONTANA, DENVER W. HOLT AND LESLIE A. LEROUX, Wilson Bull., 108(1), 1996, pp. 123-128
♦ 2Mustela frenata, Steven R. Sheffield and Howard H. Thomas, MAMMALIAN SPECIES No. 570, pp. 1-9 (1997)
♦ 3Microtus montanus, Wendy E. Sera and Cathleen N. Early, MAMMALIAN SPECIES No. 716, pp. 110 (2003)