Sorry for just getting around to this but this is great I really liked it. I've had a few concussions and I seem to be out of commission for a month or so after (mentally speaking).
I would have never thought to ask why woodpeckers don't get concussions.
I've only ever had one, the walking into a door story that this post begins with is a true one. :D
Yeah concussions are no joke, its pretty amazing how well equipped these birds are for dealing with the forces they exert on their own heads.
I slipped on some ice a few months ago and got one. I called into work the next day.
A week or so later I had a conversation where I was saying, "I know I called in but I really can't remember why".
Oh yeah, it was a concussion lol.
Jeez, thats actually a little scary!