Why dont wood peckers get headaches??

Scientists have studied and found out that unlike humans wood peckers have a thick layer of cartilage in the front side of their skull. This cartilage acts as a shock absorber so when it hits it's beak on the tree the cartilage absorbs the impact. I can relate when I fell and hit my head on the ground my sweater absorbed some of the impact.  The sweater was like the cartilage for my head.