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Thread Starter 
Somewhere I heard about the "Liberator" collar (from Australia). Their website describes it as having an alarm which is "activated by the characteristic leap of a cat as it launches itself at a bird."

I'm wondering whether anyone has used one and whether it helped stemmed the bringing of prey into the house. (It's not the dead "presents" I object to--it's the live mice etc. that are let loose in the house!)