Okay doke! So you should check out the App! I think we have a solid alien
The only things left really is the culture. What are some strange and unique customs they have? Their concept of luck, what is taboo, rituals, marriage (do they have it?), how do they raise their children? Think like they might, my guess is that impersonation would be the greatest crime, as in a world like this how can they be sure who they are talking to is actually who they say they are? Which would then bring me to the next question of social status and how do they identify each other? How do they communicate with others, and percieve the world (are they sight seers like us humans, are they great listeners, smellers, ect... Do they have a media, and if so how is like?)
Here are also some thoughts. What would be their favorate ciusine (if that is even possible for a 'eat what I see' kind of creature)? What is their warrior culture(s), seperate nations, ancient mythology/belief, money system? Basically what I'm asking you to do is brain storm ideas and ask yourself and others questions. The most important factor however that I would like to stress is you need to be able to think like they do, by observing what we made together. Consider their weaknesses as much as strengths, but be sure to always return to the base. They are Avians (Birds), so be sure they at least resemble what an intelligent bird (haha) would think like. My personal opinion would be that they are usually vain, (showiest colors/forms) competitive, and utilize an economy based culture (who has the most of what, and who has more than someone else). They might be more mathematically based (flying is complicated, and so might shapeshifting) or artistically based due to being flashy birds.
So give that some thought too. I'll add my suggestions for now. Hope everyone is still involved
(btw, the Gaians should be done tonight as well, and if you haven't been following along they are a race intended to be used as a bridge between Star Wars and Avatar: The Last Airbender (/Legend of Korra). Look up either of those if you don't know what they are.)