Nightwatcher worm

Nightwatcher worms, also known as Arconan night terrors and sandborers, were a little-documented species of nocturnal sand-boring worms native to the planet Jakku. Mature specimens topped twenty meters in length, although some were reputed to be much larger. According to the scavengers of Jakku, nightwatchers remained under the sands motionless, but at the slightest vibration from something moving on the surface, they sprung up out of the sand and snapped onto their preys. With their triangular heads featuring large red eyes, nightwatchers bore a passing resemblance to the Arcona, a sentient species with a humanoid body. They could eat anything, since their mouthparts could grind metal into scrap, and their stomachs generated acid to melt down anything they could not digest.

The Imperial Commodore Visler Aqorian Korda III studied the nightwatcher worms and created a gigantic droid in it's image. Following the attack on Tuanul, the astromech droid BB-8 was spied upon by one such worm. The nightwatcher rose from its burrow and squinted its red eyes, making a curious sound as the BB unit rolled by.

Text and facts from the “Nightwatcher worm” article on Wookieepedia, licensed under CC BY-SA 3.0. Modified for this site.