Lloyd - If the birds are frozen in water (completely submerged), I would say they last several years in the deep freeze. Case in point: At Thanksgiving last year, I found a wild turkey breast at the bottom of the chest freezer which had been frozen in water. I believe the date on the bag was 4/2016. My wife is a huge fan of wild turkey meat so I thawed it out and it was perfectly fine and tasted great. In the past, I have had a few birds (mainly pheasants) that did not get completely submerged in water and ended up with some freezer burned areas. After removing the freezer burned areas, they ate just fine as well. If your grouse are not freezer burned, I would think you are good to go. Yes, I need to do a better job of freezer inventory management
