While walking outside I saw a white-breasted nuthatch doing an interesting behavior I’d never seen before: it was perched on the palm tree in the photo, and was repeatedly spreading its wings wide and swaying from side to side, almost snakelike:

When I got home I checked a reference guide, which mentioned this is a behavior that white-breasted nuthatches will do to deter nest predators. I couldn’t figure out exactly why it was doing it when I was there in person, because I didn’t see any snakes or other birds. But I did see a clue in the OP photo, and my reference even specifically mentioned this animal as a nest predator of nuthatches.

So, did everyone else see it immediately and I’m just slow? 😁