in my younger days when hunting was considered normal and less frownd upon than it is today,I used to be out most days and everything was fair game and most of it had a price on its head, anything I was left with or had been bruised by hard mouthed dogs,so could,nt be sold to the local game dealer, went to the zoo, as most predictors need fur bone and feathers in there diet, they used to pay me 25p for a rabbit or squirrel, in the 1980s so I would think if you have a large surplus on a regular basis you could probably still strike up a deal if you have a zoo,wildlife park or raptor centre near