I think the biggest factor is the little buggers know how to get trees between them and you, or at least it seems that way.
Ron, you are absolutely correct about the shock factor when they decide to flush, perhaps it should be called a startle factor. It kinda makes you freeze for a second and that's all they need.
John, I have been pheasant hunting when the price per pound was infinite!!! ie, lots spent and no birds seen!!!
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