Page:A History of Land Mammals in the Western Hemisphere.djvu/173

Fig. 55.—Musk Ox (Ovibos wardi) female; the males have much larger horns.
—By permission of the N.Y. Zoölog. Soc.

Fig. 56.—Arctic Fox (Vulpes lagopus) in winter dress.—By permission of the N.Y. Zoölog. Soc.