ON TREES AND BIRDS. 



159 



matter (insects), and 32 per cent of vegetable matter. 

 The former is made up of small caterpillars, and moths and 

 their eggs. Prominent among the latter are the eggs of 

 the tent-caterpillar moths, both the orchard and forest 

 species. As these are two of our most destructive in- 

 sects, the good done by the chickadee in devouring their 

 eggs needs no comment. During the winter months the 

 chickadee's food is made up of larvae, chrysalids, and 

 eggs of moths, varied by a few seeds, but as spring 

 brings out hordes of flying, crawling, and jumping in- 

 sects, the bird varies its diet by taking also some of 

 these. 



8* 



HOUSE WREN. 



