Grim instructions but here they are if anyone ever needs to take a chicken to the "circus".

Obviously these were written out for a newbie but if ya'll ever want to make an adult sized chamber that you can keep for emergencies because all this stuff stores great here ya go.
1) One or more disposable canisters of compressed Helium Gas, available for purchase at many big box stores for under $20 for inflating party balloons. These can be kept on hand for the appropriate time, and will “keep” for several months. After use, simply recycle the empty containers, or discard them in the regular trash.
2) A crate, cage, or other container for your bird.
3) A very stout plastic bag, large enough to completely enclose your bird's cage. If the cage is particularly big, you may have to get a “tree bag” from a garden center, or create a large enough bag out of several heavy bags and a lot of duct tape. The seal is very important, so tape both sides of all joints.
4) Some stout string, about 12 inches long.
5) A twist tie, the kind used to seal bags of fruit or vegetables.
6) Stout masking tape, packaging tape or duct tape.
7) Some very private and quiet time, once you know you are ready.
Step 1) With your bird in the cage, close the door and put the nozzle of the helium canister in the open end of the bag. Use the length of string to tightly secure the bag around the nozzle, so that the nozzle is protruding into the bag. Make sure there are no leaks and that the nozzle is unblocked by plastic bag.
Step 3) Open the valve on the helium tank, and begin to flood the bag and cage with helium. If the cage is small and the bag is big, this is all you have to do. If the cage is large, you may need to make a small cut in a corner of the bottom of the bag, to let out the remnant air as you flood the cage with helium.
Step 4) Once the cage and bag are fully flooded, and the bag looks quite inflated, close the small hole in the corner of the bag with the twist tie, if you had to make one. Secure it tightly. Continue to maintain constant, but not extreme, pressure in the bag. You want the bag inflated, but not ready to burst.
NOTE: During Steps 3 and 4, you will hear your bird relax and almost immediately slip into unconsciousness. It only takes few seconds, and there is NO PAIN. Breathing may become very deep, and you may hear some panting. Following this, and very briefly, you may hear your bird move about rapidly. DO NOT PANIC. This is merely a seizure; a sign of an oxygen-starved brain. Your bird is TOTALLY unconscious during this time, and CANNOT feel any discomfort or fear whatsoever.
Step 5) Leaving the bag sealed to the helium canister, and after checking for any leaks, retire to your favorite comfy chair and listen to some music.
Step 6) Periodically peek to make sure the bag is still inflated. Breathing will slow, and then become sporadic, finally stopping altogether, between 9 and 30 minutes from when the bag is first flooded with helium. Just to be sure, listen after 40 minutes, and if there are no breath sounds, you have done it; CONGRATULATIONS, You have released your bird from his/her pain.
Step 7) Open a nearby door or window, and ensure proper ventilation of the area around the cage. Then, open the bag and allow the helium to escape. Remove the bag from around the cage. DON’T WORRY. What you will see is a completely peaceful animal, which CLEARLY did not experience any discomfort.
Best part, if you never have to cull anyone you can fill balloons.
