I use my bow, even though it calls for crossbow. Just make sure you have both equipt. Then choose swap and bingo, you can now hunt with a bow anywhere you want.
Not sure what region is the best for ducks, but I do know the Hornbill ducks don't count. I waited for the gun to go off sale, and I was able to buy it with hunter bucks.
My wife's android tablet done the same thing. I went into her settings and reset all apps. Turn it off all night and restarted. I loaded deer hunter again, but her gold was still gone. Whenever she wins gold, it doesn't give it to her. Still trying to figure the gold part out.
Thanks a lot! FYI in region 7 zombie hunt, you can get a lot of brain shots on the last hunt. Just wait for them to leap and you can kill 5, get killed and go kill 5 more.