Not sure if y'all care about such things, but dry ice as a carbon dioxide source is no longer listed as being "humane" in the last update to the AVMA Euthanasia Protocol. It is near impossible to control the flow of CO2 using dry ice, and that can cause either panic from rapid onset of unconsciousness or prolonged suffering due to lengthened onset.And it doesn't kill pinkies or fuzzies well at all; they are resistant to CO2 euthanasia.Doesn't mean non-veterinarians or non-researchers can't still use it, but thought you might be interested.
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