I believe he was referring to putting up fake squirrels and songbirds. These are referred to as confidence decoys, and are used by waterfowlers in the form of blue herons. The way I see it, if the deer sees a motionless squirrel a few feet away from you, the deer will also see you. Squirrels and songbirds only seem to get noticed by deer when they start chattering and making a commotion.
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