In summer, if it gets too hot or dry, they do the same thing. Because they are almost universally regarded as pests, there is lots of information about slugs. Several different state agricultural extension services , including Virginia s , have substantial Internet sites and pamphlets discussing them. The pest control industry maintains a web page full of weird and interesting information about them. Among gardeners, the consensus seems to be that though there are traps and poisons to control them, the best way to get slugs out of your garden or flowerbed is to pick them up, put them in a bag, and throw them in the trash.
Night time is the best time, according to one source.
A good flashlight and rubber gloves are recommended. It seems weird to me, but a number of people seem to regard slugs as a sort of hobby or enthusiasm. Presumably, somebody has created all of that material, and some of it is remarkably interesting and inventive. Odd, isn t it, the ways that people spend their time. To each his own, I guess.