On this site, almost anything goes, except for all-powerful God-like creatures. As far as I know, you can create any kind of avian race you want! Just create a character of that race! There's been some talk about opening up a place to post your new race, but for now, just make a character of almost any race you like, you can even create your own new race!
If you have any more questions, I suggest you contact Rhi or any of the other moderators.
I hope this helped,
JackieCat :))