SQ.UIRREL. 
291 
of one of the larger branches of a great tree the 
squirrel constructs its nest, by binding together 
moss, twigs, and dry leaves, in such an artful man- 
ner that it will resist the most violent storm. The 
nest is completely enclosed, except a small open- 
ing at top for the animal to creep into ; and this 
very opening is so sheltered from the weather by a 
conical cover, that the inhabitant remains perfectly 
dry in the heaviest rain. 
In the high northern latitudes the squirrels are 
red in summer, but change at the approach of win- 
ter to a gray. This change of colour is effected 
gradually, and the furs are greatly esteemed for 
their exquisite softness. Whenever they are com- 
pelled by want of provisions to quit their lofty 
alpine abodes, they migrate in amazing numbers, 
and travel directly forwards, with a determination 
to overcome every obstacle ; neither rocks, forests, 
nor even the broadest waters can stop their pro- 
gress. If the credit of Linnaeus did not give a 
sanction to what we are going to relate respecting 
the extraordinary manner in which they cross the 
broadest rivers, it would hardly be believed.— When 
they arrive at the edge of the water, and perceive 
its breadth, they return in a body to the nearest 
wood in quest of bark, which serves them instead of 
boats, and upon which they boldly commit them- 
selves to the mercy of the waves, every squirrel sit- 
ting on its own vessel, and fanning the air with its 
tail. In this regular manner they commence their 
navigation; but although they set out with every 
