We built a euthanasia chamber for my husbands beloved bantam roo he couldn't handle letting me off him in the normal way. Basically a 5 gallon bucket with a plywood platform inside to keep the roo above the ice. Put the ice in, set the platform in place, pour in warm water, immediate CO2 fog forms, set rooster on the platform and put the lid on the bucket. It should have quickly and quietly euthanized him, but apparently we used WAY WAY TOOOOO much dry ice. We blew the lid off the bucket. Quite an impressive BBBBOOOOOOMMMM!!! It would have been funny if the roos end had not been involved. My husband was upset. We let a lot of the reaction go then put the pid back on but not air tight then left it for a good 1/2 hour. The roo passed without apparent suffering after the explosion. If we use that method again I will use 1/2 lb of ice not 3 lbs.