Sport Plast’s Black Bellied Whistling Duck, also known as a Black Bellied Tree Duck. Knutson’s has done it again! We are the first to market a decoy for the Black Bellied Whistling Duck. After many calls for a decoy of this rapidly increasing duck, we went to Sport-Plast to see if we could have a decoy produced. They listened. The SP-5500-10 Black Bellied Whistling Duck is now in stock. The staked decoy measures 23.5” from tail to bill and approximately 8” wide. The decoy comes with a 20” stake that can be used on land and sea. For deeper water, you can use a stick of conduit to stake the decoy above the water line. Currently the decoy only comes in a sentry position. The duck is becoming more commonly found in the South East US. Currently they are found in the following states: Texas, Louisiana, Florida, Mississippi, Arkansas, South Carolina and Arizona.