C ECONOMIC VALUE OP BIRDS. 



ill devouring small rodents, in destroying the seeds of 

 liarinful plants, and in acting as scavengers. 



Leading entomologists estimate that insects cause an 

 annual loss of at least two hundred million dollars to the 

 agricultural interests of the United States. The state- 

 ment seems incredible, but is based upon reliable sta- 

 tistics. This, of course, does not include the damage 

 done to ornamental sliriibbery, shade and forest trees. 

 But if insects are the natural enemies of vegetation, birds 

 are the natural enemies of insects. Consider for a mo- 

 ment what the birds are doing for us any summer day, 

 when insects are so abundant that the hum of their united 

 voices Ijecomes an almost inherent part of the atmosphere. 



In the air Swallows and Swifts are coursing rapidly 

 to and fro, ever in pursuit of the insects which constitute 

 their sole food. When they retire, the Nighthawks and 

 Whip-poor-wills will take up the ch hing moths 



and other nocturnal insects which wouk e day-iiying 



birds. The Flycatcliers lie in wait, darting trom ambush 

 at passing prey, and with a suggestive click of the bill 

 returning to their post. The Warblers, lie-l'+ active crea- 

 tures, flutter about the terminal foliage, ^uh almost 

 the skill of a Hummingbird pick insects from leaf or 

 blossom. The Vireos patiently explore the under sides of 

 leaves and odd nooks and corners to see that no skulker 

 escapes. The Woodpeckers, Nuthatches, and Creepers 

 attend to the tree trunks and limbs, examining carefully 

 each inch of l)ark for insects' eggs and larvae, or exca- 

 vating for the ants and borers they hear at work within. 

 On the ground the hunt is continued by the Thrushes, 

 Sparrows, and other birds, who feed upon the innumer- 

 able forms of terrestrial insects. Few places in which 

 insects exist are neglected ; even some species which pass 

 their earlier stages or entire lives in the water are preyed 

 upon by acpiatic birds. 



