Attributes / relations provided by
♦ 1del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.).
Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona.
♦ 2Zapus princeps, E. Blake Hart, Mark C. Belk, Eralee Jordan, and Malinda W. Gonzalez, MAMMALIAN SPECIES No. 749, pp. 17 (2004)