Grutchin
this bio-engineered form of living starfighter weapon was created by the Yuuzhan Vong. Resembling black, armored turfhoppers, the half-meter-long grutchins were sent out after an advanced force of coralskippers reduced an enemy fleet to near-destruction. The insectile grutchins were released from an ovoid holding ship, and latched themselves onto still-operative enemy ships. The grutchins then used acid-dripping pincers to chew through the enemy ships and render them inoperative and incapable of sustaining life. However, they were living creatures, and couldn't survive a trip through hyperspace. Unlike much of the Yuuzhan Vong's bio-engineered technology, the grutchins were unintelligent weapons of destruction. Once released, they could not be recalled. Those that were not killed in battle - either by enemy fire or by Yuuzhan Vong clean-up parties - remained viable individuals that would attack anything that moved, and often fled the scene of the battle and wreaked havoc in the galaxy. They couldn't reproduce, so any that got away would eventually die out. Note that the New Jedi Order Sourcebook indicates that grutchins and reproduce and multiply quickly. Also now that The New Essential Guide to Weapons and Technology indicates that grutchins can survive a trip through hyperspace.