The Poison Shaker was designed to imitate the feeding tones of contented Ducks. Safety is the #1 concern of a migrating Duck. A close second is a Food source. The Poison Shaker Feeder Duck Call gives you Both! The Feeding Chuckle says I'm safe, and content, while letting other Ducks know there is food in your spread. This is a deadly combination in the blind. With the easy to use Shaker Style design you get low movement, and the perfect realism of Feeding Ducks in your Decoy spread. The Poison Shaker Feeder Duck Call gives the illusion of Food plus Safety...and that can add up to more Birds in you Bag