CO2 works really well and is my preferred choice. I go to university and so just get a little chunk of dry ice from the science labs, then put the mouse in with the ice for 20-30 seconds; the gas puts the mouse right to sleep (the way I'd prefer to die, rather than slow freezing or snapped spine or THUNK). Just be careful to take the mouse out as soon as it stops moving, so it doesn't get too cold.
I have been feeding my BRB this way since I got him three months ago and it works beautifully. Also it's the least "hands on" which is good for a squeamish girl like me!

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• Humane mouse killing question - dekaybrown, Sun Mar 9 18:57:59 2008
• RE: Humane mouse killing question - DMong, Sun Mar 9 21:10:52 2008
• RE: Humane mouse killing question - dekaybrown, Sun Mar 9 23:29:06 2008
• RE: Humane mouse killing question - DMong, Mon Mar 10 00:13:08 2008
• RE: Humane mouse killing question - viborero, Mon Mar 10 10:26:00 2008
• RE: Humane mouse killing question - DMong, Mon Mar 10 11:21:59 2008
• RE: Humane mouse killing question - superdave1781, Mon Mar 10 18:02:20 2008
• RE: Humane mouse killing question - mldolan, Sat Mar 15 08:02:00 2008
• RE: Humane mouse killing question - RadioBRB, Tue May 13 18:12:51 2008