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♦ 1National Geographic Magazine - May 2016 - Yellowstone - The Carnivore Comeback
♦ 2Foraging by lynx and its role in ungulate mortality: the local (Białowieża Forest) and the Palaearctic viewpoints, Włodzimierz JĘDRZEJEWSKI, Krzysztof SCHMIDT, Lech MIŁKOWSKI, Bogumiła JĘDRZEJEWSKA, Henryk OKARMA, Acta Theriologica 38 (4): 385-403
♦ 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)