320 



BACKBONED ANIMALS. 



that quantities of material are found there. A watch lost by a traveler 

 was afterward found in front of a hole. 



Squirrels (Sciuridiz). -5- The squirrels have a wide 

 geographical range. They have powerful, compressed in- 

 cisor teeth, prominent ears, the snout and upper lip di- 

 vided, and long tails with hairs generally arranged along 

 the sides. The gray and black squirrels attain a length 

 of two feet, including the tail. They vary much in color, 

 from black to all shades of gray. The gray squirrels make 

 wonderful migrations, passing over the country in vast num- 



bers, swimming streams, and divesting the land as they pass. 

 The tufted-eared squirrel, of the San Francisco Hills, is 

 one of the finest American species. The striped squirrels 

 (chipmunks) (Fig. 346) have enormous cheek-pouches, 

 used in carrying food to their nests. The flying squir- 

 rels (Fig. 340) have a fur-covered membrane, extending 



