I walk with a couple of classmates and during discussions about slugs heard them refer to the critters as Schnecke now and again (though generally we are just using English). More recently, discussions turned more to snails since they have been coming out in droves. Before I had called them snails, one of my classmates was describing a story about his son and a snail, in which he referred to it as a slug, but the "kind with a curled house on its back". A snail! Then later in a different discussion another classmate referred to it as "the type with a house".
I started to wonder about the German words for these things because of the reference to snails as slugs with houses. So, I checked it out. The German word for a snail, not a slug, is Schnecke. It seems that it's also used as a way to refer to slugs, though, since I have heard it used for them. The German word for a slug is Nacktschnecke - naked snail!! I like this concept that having a shell is the default, and it's not having it that is special. And to add to the cool language fun (I'm a geek), a snail shell is a Schneckenhaus - a snail house.
German is cool.