In Spiritualist's beliefs we believe their are humans and animals in the afterlife, each with their own soul groups. We all begin as lower life forms, and gradually with each incarnation, move up the scale from the lower animal life forms, through more intelligent animals such as horses and elephants etc. until the time comes high forms are ready to be incarnated as human spiritual beings. We then continue reincarnating and evolve to higher levels of consciousness in our human form.