I'm almost out of frozen pinkie mice, which I feed my baby corn snake every 5 days... one of my breeding mice is very pregnant now, so I'm planning to take at least 4-6 of them as pinkies to freeze. Do I have to bother with a CO2 chamber (which I don't have yet) and all of that, or can I just stick them in the freezer? I'm not into torturing animals of any size/age, but wonder how necessary a full euthanasia is for BRAND new babies. Is there another way to humanely kill them?