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Autofocus tracking on camera is also very helpful!

that means in photography must find the right timing to take pictures ?

You can shoot in burst mode, take 10/20 pictures in a short time.
And than select the picture with the best movement of the bird.

I call it "spray and pray" :) at least that's what I do... I'll have to watch some boats and see if the birds follow around here. Great tips and Awesome photo!

ok thanks so much tonyz :)
seems now I get new knowledge about photography