I don't think the picture you linked is a true HDR. I've never been able to capture a good one hand-held, even of stationary objects and I've got pretty steady hands overall. There's no way to take three different shots of birds in flight and have them match up like that.
Using a sturdy tripod, mirror-lockup, auto-exposure bracketing, and cable/remote shutter release is your best bet.
__________________
--MR.SKI
|