I have four Giant African Land Snails in a large plastic tank (well storage container, the tank got too small!). They like to climb up the sides and I spray it with tepid water, so they can slide up and down and have a drink. One got out and climbed up the wallpaper. I tried to lift it off but you have to wait until they are ready to let go, they have got quite a bit of suction - when it came away from the wall it had eaten the wallpaper and I now have a snail's foot shaped bald patch right in the middle of my front room wall!