Small, silent, deadly arthropods,
kouhuns are extremely poisonous creatures employed by assassins who don't want to be traced. They can be delivered remotely, and instinctively seek out the body heat of their target.
Zam Wesell employed a pair of kouhuns in an assassination attempt against Senator Padmé Amidala. She stowed the creepy creatures aboard her ASN-121 droid, and dispatched the floating mechanical to Padmé's Coruscant apartment. Cutting into her bedroom window, ASN-121 released its deadly cargo. A sudden burst of Force-intuition alerted protector Anakin Skywalker to the kouhuns' presence, and he stormed in and hacked the creatures to death with his lightsaber.