The Albion did a lot of gengineering back in their day, leaving behind a lot of species as their legacy.  You’ve heard of the Arnam and Peloran.  Most of you haven’t heard of the others.  Most have full human intelligence, which makes them awful interesting to work with.  They don’t live close to Earth at all, so aren’t really part of our sphere of influence.  That’s the reason people give for not teaching about them.  Me, I think they have other reasons.