Man likes to debate whether we're animals or not. Most often we think we're special. Yet we entertain the idea of being like animals.
What if one was considered to be on top? How about the others considered lower? Do they let "nature" take its course? If we were all really biologically different, would we still acknowledge one and another?
These people would be classified as Detherions. And there would be nothing to entertain about their lives.
