A rat roach was a pest that occasionally infested starships, typically after docking at a low-class spaceport. They were approximately the size of an outstretched Human hand, with two long antennae and backs covered with many quills. They bred inside of bulkheads and other similarly dark places, and were known for gnawing on wiring and circuitry. When threatened, rat roaches would dig into inconvenient-to-reach spaces and bristle up their quills to protect their antennae.