The sleen were a species of insect-eating lizard native to the planet Dagobah. They lived in holes in the ground and hollowed-out logs. The Jedi Knight Luke Skywalker encountered a sleen in the Cave of Evil while he trained on Dagobah.
- Star Wars: Episode V The Empire Strikes Back (First appearance)
- Star Wars: Absolutely Everything You Need to Know (First identified as Sleen)
- Star Wars: Complete Locations
- Star Wars: Galactic Atlas
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