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• colony of great blue herons in a nontidal environment. Can. J. Zool. 71:1075 -1078. Thompson, D. H. 1977. Declines in populations of colonial waterbirds nesting within the flood plain of the upper Mississippi River. Proc. Colonial Waterbird Group 1:26 -32. Thompson, D. H. 1978a. Declines in populations of great blue herons and great egrets in five midwestern states. Proc. Colonial Waterbird Group 2:114 -123. Thompson, D. H. 1978b. Feeding areas of great blue herons and great egrets nesting within the flood plain of the upper Mississippi River. Proc. Colonial Waterbird Group 3:202 -213. List of Figures Fig. 1. Location of great blue heron and great egret rookeries where feeding habitat data were collected in 1998 (see page 2). 8 Fig. 2. Frequency distribution of flight times for great blue herons from Peltier Lake rookery in 1998. Fig. 3, Frequency distribution of flight times for great egrets from Peltier Lake rookery in 1998. 411 Fig. 4. Frequency distribution of flight times for great blue herons from Smith Slough rookery in 1998. • Fig. 5. Frequency distribution of flight times for great egrets from Smith Slough rookery in 1998. Fig. 6. Frequency distribution of flight times for great blue herons from Vermillion River rookery in 1998, Fig. 7. Frequency distribution of flight distances for great blue herons from Peltier Lake rookery in 1998. Fig. 8. Frequency distribution of flight distances for great egrets from Peltier Lake rookery in 1998. Fig. 9. Frequency distribution of flight distances for great blue herons from Smith Slough rookery in 1998. Fig— 10. Frequency distribution of flight distances for great egrets from Smith Slough rookery in 1998. Fig. 11. Frequency distribution of flight distances for great blue herons from Vermillion River rookery in 1998.