Sand martin, Riparia riparia, two birds mating, Worcestershire, June 2017. From a portable hide.
Olympus EM1 Mk2. 300mm f4 lens. 1/4000th at f6.3. 1600 iso. Taken using the Pro-capture mode at 60 fps. This means holding the release button half way down so the camera is taking pictures at 60 fps, but not writting them to the SD card. When the button is fully depressed it starts writting to the card and includes the 14 images prior to you pressing the button. Means you can sleep on the job and still get the moment.