Swamp slugs were giant gastropods native to Dagobah.
An omnivorous species, swamp slugs had thousands of teeth and twenty-four pairs of legs. Their orange or golden eyes, the size of boulders, allowed them to see clearly beneath the murky, cloudy waters, while the two rubbery antennae on the top of their heads, which grew to two meters, utilized sonar to pinpoint exact locations of objects, searching by motion. Swamp slugs were omnivores, eating anything organic that they could fit in their mouths of jagged teeth. The teeth, or radula, lining the slug's esophagus would then pulverize into organic slime any plant or animal matter that it ingested. A hermaphroditic species, the swamp slugs reproduced sexually. Each partner would lay hundreds of eggs, most of which were eaten by other animals. They exuded a thick, foul-smelling mucus which damaged the breathing organs of other species. They were not desirable to eat by other predators and were given a wide berth in the swamps.
The Besadii Hutt crimelord Gardulla kept swamp slugs in the swamps and pools of her luxurious if notorious pleasure garden, within her Tatooine palace near the Dune Sea. In 32 BBY, while in pursuit of escaped slaves, one of Gardulla's Dug mercenaries, Khiss, spray-stick blasted a huge swamp slug back into the waters whence it surfaced to devour him.
- Episode I Adventures 7: Capture Arawynne
- Rogue's Gallery (as a trophy)
- The Force Unleashed II novel
- Scoundrel's Luck (Mentioned only)
- Star Wars: Empire at War
- Star Wars: Empire at War: Forces of Corruption
- Galaxy of Fear: The Hunger
- Star Wars Infinities: The Empire Strikes Back (Non-canonical appearance)
- Junior Jedi Knights: Anakin's Quest
- The Illustrated Star Wars Universe
- Galaxy Guide 3: The Empire Strikes Back, Second Edition
- The Essential Guide to Planets and Moons
- The Essential Guide to Alien Species
- The Wildlife of Star Wars: A Field Guide
- The Official Star Wars Fact File 4 (DAG4, Dagobah)
- The Official Star Wars Fact File 91 (DAG9-10, Dagobah Swamp Creatures)
- Inside the Worlds of Star Wars Trilogy
- Star Wars: Empire at War: Forces of Corruption: Prima Official Game Guide
- The New Essential Guide to Alien Species
- Nexus of Power
- The Complete Star Wars Encyclopedia