The third one rocks.
I like it over the second because the wings are all up. It's the proverbial moment captured.
I do think the second has the plus of seeing all three birds heads. I still prefer the third.
I wonder if those two would look better shot in landscape. *shrug*
The subject, while technically well done, is just one of those that photographers have seen done to death. That you caught a chase, and one has a fish definitely adds more of a story than the typical gull shots though. I think I also want say that because your shutter speed is so high, you eliminated all indication of movement and I have to take a point off. If you were panning, catching a little linear blur on the water would have definitely increased the drama of these two images.
So, I am on the fence on whether to say your subject is boring, or give you a pat on the back.
Nice sharp images. :thumbup: