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Try a waterproof, slow set epoxy. I repaired a plastic transducer bracket that stayed underwater under pressure, and had it stay together. I have also used it in woodfinishing to fill voids in cherry and know that it will adhere well to wood. Roughen the surface of the plastic where it will be hidden under the wood for a better mechanical bond. I have been thinking of making birds myself using either plexi, 1/8" baltic birch plywood (available from hobby shops for model airplane making) or stainless steel for the wings. I have some sheet stainless that I use for making plug lips. Also, think about using mechanical fasteners. I have been thinking of using a couple of pins or screws as well as epoxy to help hold the "wing".
On the birds I have seen the wing does not cut the body completely in half. That could well be a contributing factor in yours failing.
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