There was certainly something there. In that general area there were dozens of geese on the water, and most were feeding like that. I don’t know if these were migrating geese or locals: we have quite a few that wil stay the winter here, some years.
I learned only recently (within the last year or so) that ducks which do this are called “dabblers”. It’s an interesting bit of knowledge, suggesting that dabblers in art, writing, photography and such aren’t casual at all – they’re the ones willing to look beneath the surface!
We haven’t had as many geese here this summer, I think because the extended period of high water in the streams altered their usual nesting areas. Maybe that had something to do with their behavior now too.