Rishi Eel's were massive worm like creatures that lived upon the Rishi moon of the plant of the same name. They lived in the many twisting cave layerd in the moon. Sometimes during the Clone Wars a single Rishi Eel managed to sneak up on a small group of Clone Troopers and devour one of them before being frightened off by blaster fire. Later another one possibly the same Rishi Eel tried to eat Captain Rex. However Rex having an expert shot managed to hit it in the head killing it.