By Shifters.org

Also known as 'Skinwalkers' and 'FleshDancers,' this is a type of shifting feared the world over. They can manifest themselves in a variety of ways. They can just merely take on the form of another entity. Some claim that the shapestealer must kill the person, animal, etc they wish to take the form of. This could also include Walk-Ins?, whereas, they leap into the body of the one they wish to steal, essentially taking it over, and may or may not kick out the 'original.' (That particular method however is also in many references describing the 'astral shift').