394 WILD ANIMALS 
or three feet below the surface and then runs ten to fifteen 
feet farther in a horizontal direction. This animal furnishes 
a good example of what is called hibernation. During three 
or four winter months or even longer it lies curled up in its 
burrow in a motionless and 
apparently lifeless condi- 
tion. Hornaday says, “ By 
the investigations of Dr. 
P. R. Hoy, it has been dis- 
covered that in the case of 
the Thirteen-lined Spermo- 
phile, the action of the heart is reduced from 200 to only 
four feeble beats per minute, the temperature is reduced 
from ros degrees to 58 degrees, and there is no visible breath- 
ing. The circulation of the blood was so feeble that when a 
limb was amputated, only a few drops of blood slowly oozed 
from the wound, while the 
nerves showed no sensitiveness. 
In fact, the animal was in a 
condition of suspended anima- 
tion, as if under the influence of 
chloroform.” In the northern 
portions of its range, this Sper- 
mophile hibernates from about 
November 20 to April 1. 
Franklin’s Ground Squirrel, Gray Ground Squirrel, Gray 
Gopher. — The bushy-tailed gray ground squirrel is found from 
Wisconsin to the Missouri River and from the state of Missouri 
to Saskatchewan. Most of the body is a yellowish gray, 
with fine wavy cross-lines of a darker color; the head is a 
clearer gray and the under surface is whitish gray. These 
animals are not generally found on the open prairie, but like 
FRANKLIN’s GROUND SQUIRREL 
RICHARDSON’S GROUND SQUIRREL 
