aia 
a condition, in fact, resembling somewhat that of 2 
hibernating animal. The “diurnal hibernation ” of the 
bat is not to be forgotten. I noticed that my Chip- 
munk invariably, after feeding, tucked his head down 
and assumed a more or less ball-like form, highly 
suggestive of a tendency to hibernation. 
There are many questions that arise in connection 
with this subject, one of which bears directly on the 
subject of Comparative Psychology: How and to what 
extent is the intelligence of animals infiuenced by 
hibernation? It may be considered pretty clear that 
both the Ground Squirrel and the Flying Squirrel 
hibernate, and these are certainly among the lowest— 
perhaps are actually the lowest—in intelligence of the 
whole tribe. We know that struggle among higher 
animals develops mental adaptation and other forms 
of intelligence, and it is rational to suppose that those 
species of squirrels that do not hibernate throughout 
the winter, but endeavour to prevail over their sur- 
roundings, as well as to adapt themselves to them 
should be more intelligent than those spending a large 
portion of each year in inactivity. 
My Chipmunk, during its captivity, under certain 
circumstances, kept to his original habits, «-g. when a 
single nut was given him he would eat it immediately, 
but if several were presented at once he would hide 
them, one by one, in a corner of his cage, or, if sufficiently 
small, pack them away in his cheek-pouches. He did 
the same with cereal grains. When coiton-wool or 
web-like material was placed in the cage he manipu- 
lated it a good deal, but finally made a bed of it,im 
which he buried himself out of sight. 
Within the last ten years attention has been called 
to “singing” in certain rodents, especially mice; but 
from numerous references in the literature it appears 
that “singing,” or something analogous to it, has been 
SQUIRRELS 5a 
