322 



ANIMAL LIFE 



FIG. 361. The weasel in summer with its prey, the mouse. Photographed in the 

 American Museum of Natural History. One sixth natural size. 



tinction. It must be understood that these character- 

 istics are secured to the species, not by its own will power, 

 but through a, process of variation and natural selection. 



FIG. 362. The weasel in winter. Photographed in the American Museum of 

 Natural History. 



