Gruntmrubs are small, furry, tree-dwelling creatures that are often mistaken for squirrels or frogs. They live in clans of several dozen, with the largest, strongest gruntmrub serving as the leader. They spend most of their day sleeping in trees, but they are excellent climbers and will sometimes leap from tree to tree to catch flying bugs. They are thought to be one of the earliest non-evolving species in the world and have relatively primitive brains.