what i sometimes do with my med-large-or jumbo s is hold them on a flat surface and put a strong pipe or instrument right behind thier head, rat should be on its belly, (i sometimes use a framing hammer). put pressure on the back of the head and push down on the neck area then pull the tail hard and put more pressure and... well you probably get the idea by now. i have used the WHACK method before but noticed sometimes the rat suffers. some people have mixed emotions about this method but it works for me. a little practice and its fairly easy.
this almost always puts the prey down instantly with no suffering.

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