I think I've killed one in my life ever. Shot with a 20ga when I was a kid dove hunting. 8 years or so ago I found one swimming on Lake Belton early one morning while fishing, probably 200+ yards from the shore. I picked him up and took him to shore and dropped him off. He was exhausted. Never moved after I brought him into the boat. After a few minutes a laying down on the shore, he finally walked off.