Attributes / relations provided by
♦ 1Lepus arcticus, Troy L. Best and Travis Hill Henry, MAMMALIAN SPECIES No. 457, pp. 1-9 (1994)
♦ 2POTAPOV, E. 2011.
Gyrfalcon diet: Spatial and temporal variation In R. T. Watson, T. J. Cade, M. Fuller, G. Hunt, and E. Potapov (Eds.). Gyrfalcons and Ptarmigan in a Changing World. The Peregrine Fund, Boise, Idaho, USA
♦ 35.1 Arctic fox, Alopex lagopus, A. Angerbjörn, P. Hersteinsson and M. Tannerfeldt, Sillero-Zubiri, C., Hoffmann, M. and Macdonald, D.W. (eds). 2004. Canids: Foxes, Wolves, Jackals and Dogs. Status Survey and Conservation Action Plan. IUCN/SSC Canid Specialist Group. Gland, Switzerland and Cambridge, UK. x + 430 pp.