Attributes / relations provided by
♦ ¹Tamias umbrinus (Rodentia: Sciuridae), JANET K. BRAUN, AUBREY A. JOHNSON, AND MICHAEL A. MARES, MAMMALIAN SPECIES 43(889):216–227 (2011)
♦ ²Ammotragus lervia, Gary G. Gray and C. David Simpson, Mammalian Species No. 144, pp. 1-7 (1980)