The original goals that the living rockets had about the destruction of the Mungus have been long gone and forgotten by now. Instead many have become crab over the millennia. But after colonizing the corpses of the planet piss the descendents of the Mu’ngus Crab have found a literal land of pure food and began adapting to this environment. The appendages that became claws in the Mu’ngus Crab have become adapted to digging into the piss landscape. All the yellow piss food has caused yellowing on the lights that are presumably eyes on the organism and are completely absent on it’s back, but we don't know for sure if they are in fact eyes because living spaceship anatomy gets confusing so we're moving on from that. They have elongated and developed a shape ideal for burrowing (or when you are this big swimming) in the piss ground to eat. Since they have no predators or prey they are pretty chill and easy going.