Tarsican stone crab

Pictured: A Tarsican stone crab slowly meanders across the Tarsican surface.

One of the only significant large species which inhabit Tarsica, the Tarsican stone crab moves extraordinarily slowly across the moon's surface until it comes time to hunt, at which point it is capable of running at high speeds. That said, the stone crab hunts but only a few times throughout the course of its lifetime, as it requires very little energy to move about the world.