It's not the bird he's flashing, but the famous reversed V sign. You just cant see his other finger cause the steering wheel spokes are in the way.
Somewhere, maybe still at work, I have a picture from a magazine of Denny Hulme, driving a Brabham, at the Flugplatz at the old Nurburgring. There is a lot of air between his tyres and the tarmac. He is giving the cameraman the reversed V sign. Now that's driving! (For those who might not know, the reversed V is a peace sign-the V-turned around so the back of the hand is facing the person you are giving the reversed V to. It means roughly the same as the middle digit, with the added benefit of most Americans not knowing what the heck it means).
-William (acknowledged expert in swear words)