Duck fat! Scoop it out of the bird, render it down, and enjoy the next time you cook with fat/oil, and make sure to give it a go with duck in cast iron or any sort of confit!
Hollywoods, Smiling Mallards, Shovelers, Spoonies, whatever you call them in your neck of the woods- a lot of guys pass on em, however, Split Reed Chef Andrew Gardner loves to shoot em and make piles of delicious sausage out of them!