The polar slitherworm split from its ancestor, moving into the other colder biomes Barlowe. It has become smaller but plumper due to the cold. It has become more of an opportunistic hunter, feeding mostly on the young of larger creatures. Its main adaptation is the ability to acquire the thawing chemicals from the thaworm and its relatives to help it move through snow and ice. Its blood it now a lighter blue to show the presence of this chemical.
Individuals live of about 9 years, reaching sexual maturity in about 2 years. Like all slitherworms, they mate with 3 sexes (egg, sperm, and hormone). When they are ready to mate they will give off chemical pheromones which are picked up by members of the other 2 sexes, they will then all meet and mate at the same time. The female will lay her eggs in a burrow dug into the snow/permafrost and guard them until they hatch; when they babies are first born the female will gather some thaworms for them to eat so they can gain the thawing chemical. After that they're independent.