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♦ ¹Geographic variation in walnut seed size correlates with hoarding behaviour of two rodent species, N. Tamura and F. Hayashi, Ecol Res (2008) 23: 607–614
♦ ²SPECIES ASSESSMENT FOR PYGMY RABBIT (BRACHYLAGUS IDAHOENSIS) IN WYOMING, DOUGLAS A. KEINATH AND MATTHEW MCGEE, United States Department of the Interior Bureau of Land Management Wyoming State Office Cheyenne, Wyoming (2004)