62 
SEED DISPERSAL. 
or are killed ; in any such case the planted nuts are not 
disturbed. At all events, some of the nuts — one now and 
Fig. 49. — A black walnut as left by a red squirrel on a small oak tree. 
then is all that is needed — are allowed to remain where 
planted. In this way the squirrel is a benefit to the trees 
and pays for the nuts he eats. He has not lived in vain, 
