Au Ra at mid-max height is about the height of an average miqo'te - average midlander. At 30 (which mine is usually at) is about as tall as a max short miqo'te. Pretty normal size for females in this game. It's just that the males are like, what 7 feet tall? The only alternative would be to make the au ra about as tall as a female roe (like taller than viera). Au Ra would definitely be MUCH less popular, either that or make au ra males as tall as a midlander or highlander males.

When it comes to male vieras, I see them at about the exact same height as females, give or take.