This is the link to the other thread on humane euthanasia using the dry ice method. This is how I did it- it effectively does the same thing as the post above me, but with much less hassle.
https://www.backyardchickens.com/forum/viewtopic.php?id=312959
https://www.backyardchickens.com/forum/viewtopic.php?id=312959
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