Don't forget about the Aarakocra and the Dire Corbies.
In Forgotten Realms the Kenku, Aarakocra and other flying races descended from the Aeree, one of the Five Creator races (or 6 if you count Dragons).
Not much is known of the Aeree. They lived and dominated Faerun some 30,000 years ago.
Dire Corbies are black-feathered, flightless bird-men, cousins to the Kenku & Aarakocra but adapted for living in the Underdark.
