MAMMALS 



403 



Photograph by E. R. Sanborn, N. Y. Zoo'l. Soc. 



FIG. 175. Black-footed ferret or weasel (Mustela nigripes), representing the family 



Mustelidae. 



Photograph by E. R. Sanborn, N. Y. Zoo'l. Soc. 

 FIG. 176. Arctic fox (Alopcx lagopus), found in arctic regions. 



