Attributes / relations provided by
♦ ¹Prey Abundance, Space Use, Demography, and Foraging Habitat of Northern Goshawks in Western Washington, Thomas David Bloxton, Jr., University of Washington 2002
♦ ²Glaucomys sabrinus, Nancy Wells-Gosling and Lawrence R. Heaney, Mammalian Species No. 229, pp. 1-8 (1984)
♦ ³Martes zibellina (Carnivora: Mustelidae), VLADIMIR G. MONAKHOV, MAMMALIAN SPECIES 43(876):75–86 (2011)
♦ ⁴Spermophilus columbianus, Charles L. Elliott and Jerran T. Flinders, MAMMALIAN SPECIES No. 372, pp. 1-9 (1991)