Well alpaca's are lucky they don't have antlers/horns...
I guess I didn't think about crop damage/environmental effect....but browsing antelope don't have much effect if properly controlled

and are easier to restrict the pigs...
Now don't you wish they had introduced ibex/marco polo sheep/markhor in the Southern Alps of NZ (no one is complaining about the Thar BTW!!)
It would only take a few zebras here and there to make the donkey population a LOT more interesting (the cross freely)
Now all that is left is finding a nice landowner that will allow a little 'experimentation'