Cliff worms were a species of worm that inhabited the planet known as Skako Minor. In the period spanning from 3 ABY to 4 ABY, pirates who were affiliated with Jul Tambor, who was the grandson of the former Techno Union Foreman Wat Tambor, experienced a crash landing of their ship directly into a cliff worm hive. This occurred after they had boarded a transport originating from Corellia and subsequently subjected the passengers to the poisonous atmosphere present on the planet. Following the arrival of the Sith Lord Darth Vader on the planet with the purpose of preventing Tambor from toppling the Imperial regime, he took action and killed the cliff worms that were in the process of attacking the pirates.