AVIANX TOP FLIGHT DUCK DECOYS BLUE BILLS 6 PK. You can only find blue bill perfection in two places: flying overhead or in an Avian-X box. These decoys feature rubberized molding material and durable paint schemes for season after season success. The pack of six includes both greater and lesser blue bills in high-contrast colors for greater versatility and a natural appearance that attracts low-approaching birds. Our weight-forward swim keel helps these divers display authentic movement on the water to complete your setup.