I don't know if any method is more human than other,but I prefer shooting in the head. And about that issue of DROWNING, I've heard a lot of stories from people (yes,a human) who are almost drowned. They have told that it's like an euphoric state in water before drowning and actually loosing your consesness. It's because your carbon dioxide level rises high and removes oxygen from blood. And that gives an euphoric feeling before drowning. Why this wouldn't happen to animals also? Anyway, I prefer shootig!