I’m not even sure I knew what this was when I grabbed the shots.
A fast bird going by, and I pointed and pressed the shutter…a bunch.
Having missed thousands of opportunities like this I now (try) to remember to have my camera / lens focused and active at about half length all the time.
Just have a lens pointed away and press the back button to focus on anything while standing around. A subject is not important, I am keeping the camera focused and the lens working. If I lift up suddenly to shoot the work is half done already. The lens has no need to hunt and seek when I get something in the view finder. It’s almost focused already.
The real trick is remembering to do it. Extra batteries are a good idea too.