I think all ferret owners should have at least one loud obnoxious squeeky toy to round up all their ferrets, if you find one missing. I have a few of these (for back-up). One of my ferrets a few years back made a hole in our dryer vent material ( NEVER USE PLASTIC) and escaped outside twice! We were out in the dark looking for him, trying everything, shaking his can of treats, leaving a cage and food out, etc ( whether I had to camp out there or not). I got the idea of using a loud peircing squeeky toy ( neighbors must have thought I was nuts doing this in the dark). Sure enough he came to it! He had been attacked by something and was taken to the vet for treatment ( he was okay). Stupidly, we replaced the plastic venting coled material with the same and sure enough it happened again. Thank God for the squeeky ball! I learned a VERY HARD lesson to never use plastic for dryer venting ( we now use a VERY HEAVY duty aluminum and also have the other end with a vent that he couldn't escape from anyway.). When I can't find a guy when they're out roaming the house, all I do is panicking way squeeze that ball and I eventually get them all rounded up! You might want to reinforce this with a treat when they come to it! Eleanor [Posted in FML issue 3413]