Glim worms are tunneling predators common to many different terrain types, although they are prevalent in desert regions. Many different types are known across various worlds, but the most common is the "winding brown glim worm." Growing up to one meter long, these tube-like creatures survive by hunting small rodents, reptiles, snakes, and insects.
These animals are covered by flexible but sharp scales, which move in layers due to the contractions of the hard muscle underneath. Because of the complex muscle structure their skin seems to be continually "flowing," as the muscle contractions power the creature's movement. Glim worms are most notable for their subterranean movement - they are documented to be able to tunnel through loose sand and soils at a remarkable 40 kilometers per hour (in fact, their surface movement rate is slightly slower, at about 30 kilometers per hour).
They tunnel at about a depth of one meter, periodically surfacing to use their remarkable vibration sensitivity to search out prey. When prey is found, they dive back underneath the ground While tunneling, their movement is untraceable (to surface creatures), but the glim worms skin can detect vibration of fleeing targets, so the glim worm can track its food and burst up to the surface virtually on top of its prey.
Glim worms can capture animals through simple contact: if any part of the worm grazes the target, the glim worm's muscles force the skin to flow out and contract around the prey. The glim worm has countless glands underneath its scales and exudes an adhesive slime which assists in this effort. Then, the rippling skin "rolls" the creature to the glim worm's mouth; food is eaten whole.
Glim worms rely almost exclusively on their sense of touch and vibration for hunting: they have no sense of vision or smell. Glim worms live about five to eight standard years, and lay one cache of 12 to 16 eggs per year, although these characteristics vary by the specific type of worm.
Glim worms are most often found in groups of three to four animals. They do not present much of a threat to Humans, but they can be quite a shock to the unwary wilderness traveler, especially when they burst to surface level to conclude a hunt.
On some worlds, glim worms are hunted for a variety of reasons. Their slime can be formulated into an inexpensive if somewhat weak adhesive, while scale-covered clothing is quite fashionable on some frontier planets. Glim worm meat is popular on some worlds; on other planets, glim worms are used to feed other meat bearing animals. | 
