This is my first Bird in Flight photo ever! I was on one of my regular walks, when I spotted a Red-Wing Blackbird in some tall grass, just a few meters from the path (~10'). I started taking photos, and had my continuous focus and tracking on when it took flight. I was at 1/1600s which was apparently enough to freeze the moment of flight, and still perfectly measured to catch the motion blur of the wing. I was at 285mm (on Sony 100-400mm) and f5.6, so considering how close the bird was , and how far the background is, the bokeh was super smooth for perfect separation of the subject.
Sony a7r3, ISO3200.