I just read an interesting blog entry from I Spy Physiology describing how woodpeckers avoid getting concussions even though they routinely bang their heads. By routinely, I mean an impressive 12,000 times a day approximately. I was amazed to learn that each time a woodpecker taps a tree, the impact is about 10 times that of an average hit in football. Turns out woodpeckers have an anatomical advantage. To find out what that advantage is, visit the blog!
By Hector Bottai (Own work) [CC BY-SA 3.0 (http://creativecommons.org/licenses/by-sa/3.0)], via Wikimedia Commons