I remember living in Little Rock in the 70's and 80's and reading about Pine Bluff arsenal south of Little Rock. They were making some chemical warfare agents. There was discussion they were making "BZ" , an incapacitating nerve agent. If you believe the official government stories in the media you are a fool...maybe these birds are the proverbial canary in the mine!

http://en.wikipedia.org/wiki/3-quinuclidinyl_benzilate

http://en.wikipedia.org/wiki/Pine_Bluff_Arsenal