The infamous Jetty at Barnegat Lighthouse often hosts a flock of resting Dunlin in the winter. They hardly stir when you walk past them on the rocks in search of Harlequins and other subjects. The problem is that they usually have their eyes closed or their heads tucked under their wings, and it's hard to isolate a single bird from the tight flock. On a visit in March I managed to hunker down on the rocks and work the edges of the flock until I was able to get one in isolation and with open eye. I did clone out one oof bird in the bg.
D7000, 700mm, ISO 800, 1/2500s @ f/7.1 manual