Dekamites, also known as swamp spiders, were large, crab-like, swamp-dwelling creatures that used discarded pieces of metal as shells. They attacked in swarms, and their queens were so enormous that they could occupy a whole 720 light freighter. During the Clone Wars, the clone trooper Rex and his men had at least one encounter with those aggressive creatures. Years later, during the Galactic Civil War, Rex had to face them again during a mission to retrieve a drive unit from an Imperial junkyard.