Hedgerow Life 
insects, which are too big to be in any 
danger from the other smaller and 
weaker insect-eating .birds. Some of 
these latter catch the smallest gnats and 
other insects which fly about in the 
bright sunshine throughout the long 
summer day, and others seek out the 
little caterpillars and grubs which would 
otherwise turn into insects if they were 
not devoured before they can grow up. 
So that all the little summer birds are 
doing a most useful work in keeping 
down the swarms of insects, which 
would, without this check, increase their 
numbers enormously, and eat up every 
green thing. 
You see, therefore, that there is a 
constant warfare going on between the 
insects and the birds—the insects trying 
to escape observation by all sorts of 
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