I have watched a lot of shorebirds in marshes and ponds as they shop for their daily protein . Egrets have a unique technique. They shake a foot out in front of them. I don’t know if this is supposed to look like bait or perhaps it startles fish back toward the bird and its ballistic beak. It does make for an interesting pose in the water, one that could be mistaken for a dance step made to a rythm unheard by me.