I use wild turkey, goose, pheasant and some duck on my arrows. None of the duck I've had guys give me were long enough to bother grinding and chopping (I don't want to use something less than 4") but they work fine for tangential fletching. If you want a "normal" looking arrow they're not for you though.
I chop the turkey, goose and pheasant with the same choppers, so the profiles are the same. Most of the farm-raised pheasant I can only get a 4" chop from. Not sure how it'd be with older wild birds.