If you have a dead bird to work with. Treat it like a toy for him flail it in front of him,tease him with it basically get him all jacked up abought it then throw it a couple of times and put it away. If he retrieves it praise the heck out of him .Less is more in this case, A few time's a week and he should "get it" rather quickly.

Make it like a reward or treat or something special.
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Favorite quote "Don't ask me how I know this" (Stam 2010)