I use about 35-40 crow decoys, and the same in pigeon decoys off to one side, as both come in to the same fields here, and they love big flocks, more birds (decoys) safer to land is what they think
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If it moves and is legal but also moral, SHOOT IT !!
i've been using about a 1/2 dozen and a painted woodpecker decoy that has the flapping wings. but i really feel like on some of my hunts lately i could of used some more. i usually just get to hunt in the woods but here lately i've been able to hunt some cattle farms with a lot of birds that feed in the cattle feed and the wheat feilds