Woodpeckers are pretty cool. They can be your free warning system to wood problems, be it rotted infested wood on a structure or a tree that's on decline, and may fall in storm. Use their warning to fix your bad wood.
I've seen a hairy woodpecker banging away at a transformer hanging from a pole on the road. I've always enjoyed the sound of a woodpecker! You can tell them apart by the drumming. Each species has their distinctive sound.