I would tend to agree with the licking. I've noticed that years that we've had bad thistle (tumbleweeds) the bellies always tend to be a bit darker. I hadn't pout a lot of thought into it until reading HG's response. I reckon I'd be licking myself too if I was having to wander around in that stuff all summer. 22 Chuck, exactly what you said. Just one of Mother natures cruel tricks!
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If God wanted us to be vegetarians, he would have made broccoli more fun to shoot at!