I just bought this home and a month later we started hearing noises in the wall both upstairs and downstairs and we noticed them more at first thing in the morning and in the late evening. I found a hole and thought it was your run of the mill squarl then my wife said she saw a mouse. This trap worked great to cover the hole. I put it up in the afternoon and that night I fought a flying squirrel! So I got it into a secondary cage and by the morning I had 3 more in this cage! All said and done I cought 9!!!!!!!!!! Of them YES 9! After getting g the first one we looked them up and found out that they will group up in the winter in groups as big as 8 adults plus juveniles. Would buy this and the extender if I had to do it again.