Here's another frame of a Caspian Tern from Metzger Marsh last week. This one has a slightly better far wing position (although not fully raised). Another frame has the far wing full-up but the near wing is just slightly lower, casting a shadow on the body. (I thought about compositing the wings, but decided against it.) And the fish is headed the wrong way. Sometimes you just can't win.
D500, 500f4 + 1.4 TC, ISO 500, 1/5000s @ f/7.1 manual.