Sometimes your subject vanishes if you so much as breathe. Occasionally the subject seems unperturbed and allows you take a multitude of photographs from which you can choose the pick and choose.
On a sunny morning in September 2019 my wife and I took the opportunity to visit RSPB Titchwell, and I spent some time on the beach looking for waders. As well as some super shots of bar-tailed godwits and curlews, I managed to approach this turnstone (and its partner) scavenging on the rock. By moving very slowly, then sitting on another nearby rock I was able to watch without disturbing its behaviour. I spent many minutes taking a variety of shots in perfect light, including the above.