Abstract
The precipitous decline of the peregrine falcon (Falco peregrinus) in both hemispheres has been attributed to certain agricultural toxic chemicals, but North American prairie falcons (F. mexicanus) have not shown drastic population change. The authors report here on the relationships of experimentally introduced dieldrin and the natural contaminant DDE to aspects of nesting success of prairie falcons in Colorado and Wyoming in 1967 and 1968. The data show that high pesticide residues in egg contents, eggshell thinning, and pronounced hatching failure are correlated events. 9 references, 1 figure, 3 tables.
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