Gulls, but I cannot narrow down the species. The focus is better on the more distant bird. Might have been better to have the foreground bird sharply in focus. Then, the viewer would be more tolerant of the narrow DOF.
I know you know, but the focus is on the rear bird. As the fore-bird is so central to your composition and also obviously has something to say, I would have preferred the focus to be on it instead.