196 



ECONOMIC ZOOLOGY 



atoned for by the insects and weed seeds destroyed during the rest of 

 the year. 



There is one way in which our winter birds do a wonderfully im- 

 portant work; it is in the destruction of great numbers of insect larvae 



:: 



FIG. 122. Fotir common seed-destroying sparrows: i, Junco; 2, white-throated 

 sparrow; 3, fox sparrow; 4, tree sparrow. (From Daugherty, Principles of Economic 

 Zoology, after Bulletin 17, Biological Survey, U. S. Dept. of Agriculture.) 



that are hidden under the bark of trees and in all sorts of out-of-the- 

 way places. During the cold months when adult insects are lacking 



