Gull pens at the Patuxent Wildlife Research Center. Gulls have become a problem to jet aircraft at many U.S. 

 airports. Mass capture methods are being explored through development of anestheticor hypnotic baits, which 

 are tested on captive gulls. Distances gulls regularly travel to airport trouble sites are being determined by 

 observations of color-dyed gulls; various dyes are tried on captive gulls to help select an assortment of durable 

 dyes that can be spotted easily at a distance. (Photo by F.C, Schmid.) 



[ The new Forestry Research Center at Olympia, Wash- 

 ington, which houses the Denver Center's Olympia 

 Field Station. 



(Photo by Denver Wildlife Research Center.) 



New outdoor holding pens at the Olympia field station 

 for testing the effect of systemic chemicals and foliar 

 repellents on a variety of forest animals. 



(Photo by Denver Wildlife Research Center,) 



