Among the GELFs, there an organism composed of cheese which was a man-eater. Although unseen, the boys from the Red Dwarf had previously encountered this GELF at some point.
When having a conversation about a distress signal coming from a derelict space station, the Iron Star, Arnold Rimmer used the cheese GELF as an example to Kryten as to why they shouldn't answer distress calls and were getting too old for adventuring. (The Promised Land)