Vapor-rats are the type of pests one can expect to find on a pirate spaceship.

Fiction

Wings Universe

In order to pass the time while they were traveling the Demon's Maw, Stormcharge and Turbolift hunted the vapor-rats they found aboard the Tidal Wave. Tornado - Decepticon Saboteur

After yet another attempt by the Hunter to eat him, Squirm derisively advised the Hunter to use his sense of smell to track down vapor-rats in the cargo hold. Hoist the Flag