The first I have ever seen. I didn’t even know they existed. Brown-headed Nuthatches actually use tools (twigs, tree bark) to poke around when looking for food.
I assumed it was a Red-breasted Nuthatch at the time, which by itself is one a rarely have seen.
It acts like any other Nuthatch, runs down a tree, not up. Same sound too. Smaller than the others but just as active.