Woodpeckers make homes for many creatures, but they damage human homes...my weekly Janesville Gazette Video (No that's not my roof)

Interesting facts about woodpeckers from Wikipedia: "To prevent brain damage from the rapid and repeated impacts, woodpeckers have evolved a number of adaptations to protect the brain. These include small brain size, the orientation of the brain within the skull (which maximises the area of contact between the brain and the skull) and the short duration of contact. The millisecond before contact with wood a thickened nictitating membrane closes, protecting the eye from flying debris. The nostrils are also protected; they are often slit-like and have special feathers to cover them."