A spray can of liquid nitrogen is always handy. . .
Echoing @WeeHector, I do the same -- very slow and nothing sudden. Shooting midday, when they are drowsy, helps. And luck plays a large role in the escapade.
I was hoping, with the nice bright light today, to get some good shots at the afternoon feeding, but the wind came up very gusty and they gave up, so I only got a couple of shots
Just what I would do with it -- obviously working from the original would have a considerable effect on the finished image (which is not to say I have any great talents at this)