Hard-headed.

Hard-headedness is a good thing when you are a woodpecker. Being used to blunt force head trauma, this Yellow-Bellied Sapsucker was able to quickly shake-off his collision with the front door at work, give us flaming what-for while we checked him over for injuries ("yep, I'd say he's fine..."), and fly off nimbly after I snapped a few photos (this being the only one in focus).