Slug (Shakespeare's Planet)

Slug is a designation given to an otherwise unnamed species of spacefaring mollusk-like sapients. They act as caretakers of an intricate network of artificial tunnels connecting countless planets, many of them uninhabited. Their relationship with the Tunnel Builders is not known, except that they don't appear to be the same species.

Biology
Slugs are limbless creatures, although their bodies are malleable enough to form tentacles that can be used as arms. Their skin is white and smooth. They look like large slugs standing on the tapered end of their bodies, and move around by hopping without feet. They have no discernible eyes or faces, and seem to communicate by some psychic sense. Humans in close proximity to them have reported a feeling as if the faceless Slugs were looking at them, accompanied by a faint tingling sensation as if a weak electrical current was running in their brains.

Appearances

 * Shakespeare's Planet, by Clifford D. Simak (1976)