Shapeshifting is a Genetic Ability,'determined and given at birth. The gene begins as the reincarnation of an animal spirit. The reincarnation is almost always of larger animals-and of the same human body mass. Some examples are, Wolves, Coyotes Leopards, Tigers,---classes of large canids and big cats. There are also the classes of Dragon and Fox Shifters. The Gene can also skip generations.

The Born shifter will have their first shift sometime after puberty.

A shifter born with an animal reincarnate, their animal spirit will have full control over their human's body. This also means they have control over their emotions, and mental state. The animal spirit is bound at the soul with their human, sharing the same body. The animal spirit knows what their human is feeling, and thinking, and they can use telepathy between each other to communicate.

Shapeshifting is a very complex process, in how it works and its ties and connections.