We have a Pekin duck with a wound that smells rotten and is infested with maggots. I think this is beyond our ability to treat. What is the best way to humanely put her down? I saw a technique for culling chicks that used an airtight container with ether (starting fluid). Would this be a quick and humane way to euthanize a full-grown duck? I really don't want to use the hatchet or shotgun method. 
