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[waruikazi]

They die in the freezer very quickly. It was a vet who told me it was a humane way to do it so as far as i'm concerned there is no problem with freezing them.

And as for grabbing their tails and whacking them as hard as you can onto some object... when was the last time you tried to do this? Their tails are so small it's hard enough to hold them using a pair of tongs! Killing them this way or trying to kill them this way will result in a tail-less pinky flying across the room still alive.