You have the ability of flight if not wearing heavy armor. and if you are wearing medium armor you have a flight speed of 45. 

having wings and hollow bones you know how to make your foot falls even quieter. 

You gain proficiency in stealth. 

you have mastered the art of fast flying, so much even, that it's hard to see you fly.

you gain advantage in stealth while flying in a straight line, and dashing.

You have darkvision up to 60Ft.

You gain advantage for perception checks that use your eyes. You an see through fog/other non-magical obscurances. normally as if it were an open sky. 

However you lose the advantage when you look through these obscurances.

Being of Avian decent you can't eat much meat. However you can still eat meat, but not in large quantities.

While falling you can your reaction to use your wings to stop your fall.

if you save on a dc 15 dexterity check, you can stop falling, and reduce you falling speed to 0.

you have claustrophobia, so when entering a room that has a ceiling of 15ft or lower you get scarred. You can work out how to play this out with your DM, weather giving yourself the frightened effect or to just role play it.

you have a gained great dexterity, form flying around at top speeds. you also gain an extra skill point from adventuring experience.