Avians are an ancient, spiritually evolved race. They have been roaming the Galaxy for eons. Billions of years even, they claim. It is rumored that they even knew the mysterious “ancient builder race” while it was around and which left technological relics of great power behind throughout the Galaxy.
Avians start with an additional level each in the Spirituality and Propulsion technologies. This allows you to more easily explore and acquire the stars you want early on. Since there is no special ability to remember they are a popular choice for beginners.