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Yeah cervical dislocation is the best. Grab a pen push firmly down on the mouses neck and either pull back on the tail whilst putting pressure down on the neck or grab the hind legs and pull.
Rats are harder to kill using the above method. Buy a glass tank and cut out a hole in one side. Connect the gas bottle to the tank. Put the rat in. Put the lid on the tank. Turn the gas on. The smaller the tank the quicker the rat will die. It is even quicker if you put multiple rats in. Take the lid off and stand back. Then freeze the rats.
Guinea pigs or rabbits,again a different method.
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