Dragonsnake

Dragonsnake (also spelled dragon snakes) was a large, predatory reptile that dwelled in the muddy waters of certain planets, including Dagobah and Nal Hutta.

Biology and appearance
Living in the murky waters of swamp-covered planets such as Dagobah and Nal Hutta, the dragonsnakes were large serpentlike beasts with sharp fangs. Although voracious, they were incapable of digesting metal.

Behavior
Dragonsnakes were predatory animals, living off the flesh of other creatures. They hid under the muddy water, waiting for their next meal to come close enough. After snatching its prey, a dragonsnake would then dive back under the water.

History
At some point during the pan-galactic conflict known as the Clone Wars, the Jedi Masters Obi-Wan Kenobi and Quinlan Vos attempted to track down Ziro the Hutt on Nal Hutta. During the mission, Kenobi was attacked by a local dragonsnake. The creature was killed when the Jedi Master thrust his ignited lightsaber in the dragonsnake's head.

In 3 ABY, the aspiring Jedi Luke Skywalker accidentally landed in the middle of watery peat bog on Dagobah. A hungry dragonsnake that hid there snatched Skywalker's astromech droid R2-D2, mistaking him for a living organism. Upon realizing that its prey was inedible, the dragonsnake forcefully spat out the droid, who survived the encounter unscathed.