Bird-frightening devices, particularly the recorded distress calls of offending species, have been used successfully in 

 driving stariiugs from city roosts, gulls from airfields, and blackbirds from feedlots. In application, the calls are 

 recorded on tape and later amplified and broadcast from trucks having sound equipment. On disks, the calLs can 

 be "broadcast" with ordinary record players. Recording (top), and gulLs being disi)ersed from the Moffett Naval 

 Air Station in California. (Photo by Denver WildUfe Research Center, top; U.S. Navy, bottom) 



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