I was out this morning checking some of my favorite spots as season opens this saturday in TN and I walked up on 4 mallards, 2 of them took to the air and the other 2 just sat there. Well after about a minute my dog and I realized they were not gonna fly. So she took after them and almost caught one but I called her off. These 2 mallards couldn't fly at all, all they could do is swim and flop across the water just like they had been shot So what's your theory?