ive read all the stupid posts from the past on getting out of combat with these birds when they attack you. everything from "fly straight up" to "strafe around the huts!"...screw that. they fixed the vertical climb combat drop bug a long time ago, and strafing doesnt do anything more than running in a straight line would do.
want to get out of combat with them while on a flying mount? stay mounted, but land on top of one of the purple roof-awnings on top of the tree huts. the bird will immediately move far away from you and combat will stop after about 2 seconds.
it is instant, it is definite... makes doing your bombing achievement a lot easier too