On mobile you can only find them in the gnarled reef dungeon
Jerboa
While the Jerboa has little practical use, some survivors enjoy its companionship as a cuddly, shoulder-mounted pet. This mini kangaroo-like creature is able to sense upcoming weather changes and its behavior will indicate when a tribe might need to prepare. The Jerboa is easy to tame, however, low torpor means survivors need to pay close attention to it while taming.
Player-written tips for taming, using, and fighting the Jerboa in ARK: Survival Ascended & Evolved.
If You Want This Adorable Creature...just play Dungeon... don't Harvest The Body Just Take The Implant...if You play casual Just Suicide and check the inventory boom you got the implant without Finishing Dungeon 😁