Vulptex

Vulptices (singular: Vulptex) were a species of foxes that lived within burrows and tunnels beneath the surface of the white and red, salt-covered mineral planet of Crait. They were distinguished by their white, crystalline fur. A group of vulptices was called a skulk.

History
After the Rebel Alliance abandoned their outpost on the planet, the Vulptices had come to roam free through the abandoned structures.

Decades later an extremely curious skulk of vulptices was present on Crait during the time of a battle that broke out between the First Order and the Resistance on the planet surface. The skulk found their way into the abandoned outpost while the door was closing, and they remained in the outpost while the battle of Crait was going on. While Luke Skywalker was distracting the First Order, the vulptices had somehow found their way out of the outpost, which seemingly had no escape. Finn inquired where the "crystal critters" had gone. One was spotted and helped them escape through a tunnel near the back of the outpost. However, the exit was blocked by a large pile of rocks. Rey used the Force to move the rocks out of the way. The Resistance was then able to follow the creatures out of the base.