Freezing something small like a mouse does not take very long at all and when you freeze to death you do go through a period of pain but then you just feel really warm and relaxed in the end. It takes 10 minutes to freeze a field mouse solid in my freezer (I do that to the ones my cat tortures until they just sit submissively in one place. As soon as I get them in the juice bottle that I use they start running around inside it like they are fine, my cat just terrifies them to paralyzation, she is quite the sadist). With a freezing period as quickly as that they just are left laying in the bottom of the bottle looking like they fell asleep. I would never recommend freezing anything that would take a long time to die but with the mice it is the safest way for me and a quick way to go for them. I certainly don't want to get bitten by a wild mouse while I try to dispatch it.
On the other hand, I think with a chick that the removal of the head (as long as it is done quickly) is the way to go.
Interestingly the use of car exhaust to put down an animal is considered cruel and inhumane, what is the difference between that and creating a CO2 chamber? They suffocate either way.
Also that article on building a CO2 chamber notes that rats killed in their original cage don't seem to be stressed or fearful. It doesn't say anything about animals put into a strange bin or box and flooded with gas while the fresh air slowly escapes.
Really there are no ways to die that are completely without stress or some sort of pain. I think that if an animal gets an inkling that something is wrong they are going to stress out. People exposed to carbon monoxide poisoning, while NOT asleep already, experience terrible headaches, disorientation, and vomiting and say it is a very scary experience.
When it comes to killing you just can't "win" it's death no matter what and death is not pleasant, ever, unless you are lucky enough to die in your sleep.
ETA: Before someone says it, no, catch and release of the mice is not an option, no matter where I released it it would either come back or turn into someone else's problem. No unpopulated areas around here and lots of farms that do not want or need another mouse.
On the other hand, I think with a chick that the removal of the head (as long as it is done quickly) is the way to go.
Interestingly the use of car exhaust to put down an animal is considered cruel and inhumane, what is the difference between that and creating a CO2 chamber? They suffocate either way.
Also that article on building a CO2 chamber notes that rats killed in their original cage don't seem to be stressed or fearful. It doesn't say anything about animals put into a strange bin or box and flooded with gas while the fresh air slowly escapes.
Really there are no ways to die that are completely without stress or some sort of pain. I think that if an animal gets an inkling that something is wrong they are going to stress out. People exposed to carbon monoxide poisoning, while NOT asleep already, experience terrible headaches, disorientation, and vomiting and say it is a very scary experience.
When it comes to killing you just can't "win" it's death no matter what and death is not pleasant, ever, unless you are lucky enough to die in your sleep.
ETA: Before someone says it, no, catch and release of the mice is not an option, no matter where I released it it would either come back or turn into someone else's problem. No unpopulated areas around here and lots of farms that do not want or need another mouse.
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