The patented (US Patent No. 10,517,291) FLOCK A FLICKER™ proved to be one of the most popular waterfowl hunting products to come along since the spinning wing decoy. WHY? Because they worked when used in multiple units, as they mimic the random, quick "flashes" or "strobe" given off by a flock of contented ducks sitting on the water or dry ground, telling other ducks: It's OK to land here.