What I was getting at is that in the Abrahamic tradition, while animals may sometimes be considered to have a form of soul, they are still kept very distinct from humans, who are considered made in gods own image. In some other cultures, such as Hinduism, although the form that a soul inhabits affects it, the soul itself can move from animal to human and back again over cycles of reincarnation, so there may be less resistance in those cultures to the idea that humans are part of a continuum rather than being a separate class of entity.