Pelicans Ih-e wholly on aquatic animals, mainly flsh. thus talking food from an environment sometimes highly con- 

 taminated hy pesticides transported by water. The Bureau is studying these relations in several Western States. 

 Aerial photograph of a white pelican-cormorant colony on the Lower Klamath National Wildlife Refuge, used to 

 determine breeding iwpulations and number of nests. (Photo by Edward .1. 0"N'eiin 







gS-»i 





A typical nesting colony of white pelicans (left), and a "huddle" of young white pelicans, Bitter Lake. S. Dak. (right). 

 The black birds are young double-crested cormorants. (Photos b.v James O. Keith, left; Paul P. Springer, right) 



42 



