I just watched a bunch of cervical dislocation video's, and CO2 chamber video's.
The cervical dislocation, when it's done by somebody that is good at it, kills them instantly. (pretty good and humane way to kill )
I also came across a couple video's where it didn't go all that well.........
Now the CO2 chamber videos were a different story ...... seems like there is always one
or two rodents that just hang on and keep gasping. Some suffering for more than a full minute. (not all that humane in my opinion)
I feed my snakes live prey. There have been times where the snake has grabbed the rodent wrong,
and did not get a good wrap, and the rodent squeeks, and kicks for a good 30 seconds before it dies. (guess feeding live is not all that humane either)
I have also committed the barbaric act of whacking a rodent against a wall . (killed them instantly)
So I guess if you are trying to kill a rodent in the quickest way with the least suffering, I would say that cervical dislocation,
and wall whacking are the 2 most humane methods. Watching the poor things gasp and suffer in those CO2 chambers is
definitely not all that humane.