I made up a small batch of resin (I use Easy-Cast, but any brand should work) and I coated both sides of the bird wing. I let it dry over night on a piece of parchment paper.

I clipped off the excess resin on the edges and drilled 2 holes in each side. I used a hand drill, but anything small and sharp should punch through the resin if you do it soon after it has hardened.

I bought a simple chain and clasp made by Vintaj brand (which is about the only company I can find at craft stores that produces jewelry findings made in the US). I attached the chain through one hole and the clasp through the other so the necklace connects in the front.