Disclosed herein is a system including a portable device for euthanizing sickor infirmpoultry. The device includes a chamber with a lid and a canister of compressedcarbondioxide that communicates with the interior of the chamber, and controls thatincludeopening and closing the chamber's lid with a pneumatic cylinder, driven by thesamesource of compressed carbon dioxide used to euthanize the poultry. A sick orinfirmbird in place in the chamber and with the chamber on its shelf on the frame ofthepresent system and the start button on the controls is pressed. The lid isautomaticallyclosed by pressing the start button, whereupon the interior of the chamberfills withcarbon dioxide and a timer is started so that, after approximately one minute,the lidopens so the dead bird may be removed from the flock.