12 



THE ENGLISH SPARROW AS A PEST. 



to the floor of the tipping chamber near the rear end to excite the 

 interest of sparrows and hasten their entrance. 



BAIT TRAPS. 



The selection of a bait trap depends somewhat upon the conditions 

 under which it is to be used. Where food is plenty, as in stable 

 yards, poultry runs, and open markets, sparrows have no incentive to 



A 



FIG. 6. Sections showing construction of Tesch nest-box trap. 



run risks; and under such circumstances a trap to be effective must 

 be simple so as not to excite suspicion. 



Sieve Trap. The sieve trap shown in figure 7 is adapted for serv- 

 ice where food is abundant. In the duck yards of the National 

 Zoological Park, Washington, D. C., it is the only trap that has 

 proved successful. It consists of a shallow box not less than 4 feet 

 square, open on one side, covered with woven wire on the other, and 

 having a small door near one corner. In setting this trap, one side 



493 



