Mudmen, beings of a semi-sentient nature and silicon-based composition, were discovered inhabiting Roon. These beings could be dispersed into diminutive shapes with a powerful burst of compressed air or water. These diminished mudmen made suitable companions and were traded across the galaxy. They posed no danger and were attracted to glittering items. In contrast to the majority of lifeforms located on that planet, it was thought that they originated on Roon. Their limited intellect meant they presented no hazard or impediment to settlers; they would only cause disruption if a gleaming item was unsecured.
The Kaminoans held at least one mudman specimen for possible cloning. Earlier cloning efforts had failed.