ENEMIES OF PLANTS. 



309 



ogy at Washington shows that 98 per cent, of 

 the food of the wren consists of injurious in- 

 sects. 



Many other birds of wide geographical distri- 

 bution are recognized as the farmer's friends; 



TIC. 105. HOUSE WREN (Troglodytes a-'ilon). 

 (United States Department of Agriculture.) 



among them are the robin, oriole (Fig. 117), 

 mockingbird, brown thrasher, chickadee, and 



o 



catbird. 



But there is another class of birds which is 

 much persecuted because the farmer errone- 



