My ducks don't get like that over food, but my one duck named Mama Duck comes after me if I try to collect the eggs she and the other birds have laid. She's vicious. I have to put a bucket on her head when I move her off of nests because the only way she won't fight me is if she can't see me. She caught me taking eggs the other day when I thought I was being sneaky and she chased me then tried to fight me through the fence of the enclosure for half an hour.