I love all types of animals and work with them daily at my home ranch as well as at work. I always look for the most appropriate and humane way to put any animal down when needed. The biggest problem for most people is to control their own emotions. I have put down hundreds of pet types, farm animals for meat and work, and wildlife at a University Pathology Dept. and at the ranch. Gassing isn't very pretty as the animal will fight as it seaks an escape route. Electrocution will stiffen the body and it will fall over and you can see the current travel between the two electrode connections ( you must hold down the button for at least a minute ) and will stop the heart in short order. The animal may revive and you have to start all over, but this time you are dealing with a panicked animal. A lethal chemical injection will make an animal fall asleep immediately. However if you don't give an overdose of the lethal chemical for that particular animal, you will have a very angry animal to fight to again give a lethat injection. The captive bolt pistol will stun the animal and render it unconcous and you must cut the jugulars to bleed it out. There will still be muscle contractions and sometimes gasping. Shooting with a gun, if you miss, well even a .22 bullet will travel a mile, and could kill someone. Even when it penetrates only into the animal's scull, you still will get the muscle twitching or if it doean't kill it instantly you will have a very panicked animal on your hands. My neighbor missed the mark on a hog with a bullet and we had to chase that very enraged hog for a half hour before we caught, then subduesd it with ropes and I slitt it's jugulars and decapitated it's head in just a couple seconds. I can do this extreamely fast as I did that deed quite often at work and at the ranch. The quickest and most humane way to butcher a bird is to chop it's head off with a sharp hand axe or cleaver. Death is sure and instant.