What was it that decimated the pheasant populations in the Midwest?
I've heard it was pesticides and herbicides used on cropfields causing eggshells to be too thin to be viable - very similar to what the widespread use of DDT did to birds eggs during the 40's, 50's and 60's. Back then populations of the Eastern Bluebird and Osprey (to name only two of the dozens of species affected) were decimated to such numbers that they have still not fully recovered.
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