One of my favorite visitors to my bird feeders are White-breasted Nuthatch. A little bit of anthropomorphism goes a long way here: they just seem so laid back and happy. Even better, they can creep head first down trees. I don't know of another bird that has that behavior.
This particular nuthatch decided that the nuts and sunflower seeds in my feeder were too good to pass up. He would grab one and then fly to a nearby tree to eat it. For the sunflower seeds, he would wedge the seed into a crevice in the bark of the tree, and then peck it open with his beak.