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ONly problem with CO2 is that you need alot of rats to make it economically viable because dry ice can be quite expensive. I spoke to a vet who said the next most humane way was to put them in a container with some tissue paper and just put them in the freezer. They just curl up with each other, get comfortable and go to sleep apparently.
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Gordo
Damn it man, I cannot make bricks without clay!
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