Speaking of killing things... How owuld I go about killing 2 1.5-2lb rats? I was going to put them in a pillowcase and whack them, or do the co2 thing, but really can't spare the cash to go get some dry ice. Should I just whack them or should I use something against their necks(hammer handle) to separate the neck from spinal cord?? Just let me know, I'm not squeamish, I just want them to die instantly...