Ann, yep I know a little about them. I was reading about them and if I recall there were several cases where the mice were badly injured and didn't die for a long time. I know I shouldn't care about that but I do. I used to have some live traps that were bigger than you can get now and they worked real well. I seem to have hidden them on myself though. The ones I have now work for the little field mice just fine but I think Henry is big enough that his tail stays under the door so he can open it again. He does go in and eat the treats out.