Newly designed 50-foot funnel net and gathering cage for capturing blackbirds at winter roosts. Floudhghts set back 

 of the net lead the birds Into the trap. As many as 200,000 blackbirds and starlings have been captured in a 2-night 

 operation. (Photo by F.C. Schmid.) 



Exploratory tests were made of the 

 effects of oral anesthetics and hypnotics on 

 gulls, with a view to finding effective 

 methods of capture. Eighty-five tests with 

 41 compounds showed that speed and extent 

 of hypnotic action are related to certain 

 aspects of the chemical structure of com- 

 pounds. Studies are being continued to de- 

 termine effective concentrations and to find 

 better chemicals. In preliminary field trials 

 with one of the chemicals, herring gulls 

 were captured successfully in four of nine 

 baiting tests. 



Banding and biological studies of birds .- - 

 Regional Directors of the North Central 



The Australian crow dap, muuiiieu iur stariings, will 

 capture many birds in farmyards. 



(Photo by Denver Wildlife Research Center.) 



27 



