We're just about to try out our third type of childproof locks. We tried the plastic latch kind. It took them about a week to figure out that a strong male could put his back to the bottom of the cabinet and open the door enough for a small female to squeeze in. Next came the strong magnetic ones (not the magna-latch, just the mangnetic closure). That worked for several months until they found just the place to put their paws to pop the doors open. Right now, we use wooden spoons through the handles of the double doors. Makes it difficult for humans to get in, so the spoons often get left out and the ferrets get in. Next, if we can find them, we're going to try the magnetic latch & key system. I expect to find the key missing and safely hidden in one of their hidy holes, until they need it. <sigh> Dick B. [Posted in FML issue 1741]