These are the known sentient races in the RFI Universe. This universe operates under a model where in sentient life is considered very rare. There are only a handful of organisms that develop sentience. The reasons for this have to do with the nature of Focus; in order to be sentient, and organism must have the ability to use Focus, even in a small way. If you cannot, on some level, exert your will on the universe, then you cannot truly be self aware.
These are the commonly accepted known races. It would not be considered strange to run into them, or talk about them in public.
These races, however, are only known by a few, if at all. While the absolutely exist, most people don't know they do, or have only heard wild tales about them.