In truth, the snake would be far quicker than a CO2 chamber. It might look more humane for them to be "put to sleep", but the constrictor is built to kill the rodent in a matter of seconds by 1) suffocation and 2) stopping the heart. While being bitten and then constricted would be very frightening to the rodent...they do not suffer from it for very long at all, their death comes very swiftly. Keep in mind that in the wild, snakes are designed to find their prey, catch it and dispatch of it quickly in an effort to maintain important energy that is better put to use in escaping from their predators.
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