Step 8: Boraxination
Before i forget, if your ducks head was smashed when you shot it or got the brains out, fill it with clay or stuffing. When the skin dries it will shrink. It would look really bad if the head was sunken in.
Try to make it look natural too.
Dont worry if you get borax on the feathers and cant get it out. You can blow it off when it dries.