The crystal fox we see on Crait in The Last Jedi trailer is a vulptex; A pack of them would be vulptices, and the name was developed by Pablo Hidalgo. Detailed today in Entertainment Weekly, the creatures will be both animatronic puppets and digital creations.
“They live within the burrows and within the tunnels beneath the planet,” [Creature shop head Neal] Scanlan says. “So there is a time where their ability to shine within the darkness, should provide a guiding light to our heroes.”
There’s another behind-the-scenes look at the visual effects of The Force Awakens at Variety. The nearly 11-minute video features visual effects supervisors Roger Guyett and Patrick Tubach, creature supervisor Neal Scanlan, and special effects supervisor Chris Corbould.