Bob Miller made Study Bills for years they show the head, eyes and feature aids in exact placement of eyes and distance between the eyes. These are $25.00 each limited supply
1 Shoveler Hen
1 Mallard Drake open mouth
1 Mallard Drake
1 Blue Winged Teal Drake Open mouth
2 Ruddy Duck Hen
2 Black Duck Drake
1 Spoonbill hen
1 Bufflehead hen
1 Dove
1 Robin
1 Grebe