Therians are people who identify, in some intrinsic way, as an animal that exists or has existed on earth. Some believe that their soul is that of an animal while others believe the cause of their animal identity is psychological. They experience primarily Phantom Shifting (Ph-Shifting) and Mental Shifting (M-Shifting). Ph-shifting is when they feel phantom limbs that correspond with their animal identity (called a theriotype). This is NOT physical shifting, almost all therians regard physical shape-shifting as impossible. M-shifting is when they take on the mindset of their theriotype. They may end up behaving more like an animal or seem completely human.