Herbicides and pesticides in over use have caused a lot of it. The more recent use of Round Up ready genetically modified corn have been greatly beneficial in reducing the amount of herbicides used.
Then also lessening of habitat in some areas.
However, there are huge areas out here with significant game bird populations for the person who is willing to walk and has good bird dogs. It is unusual that those who hunt with me have not had the opportunity to limit out. End of season 2012 with a hard drought was difficult but we still found birds.
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