One spring I was working Battle Creek for some brookies and I heard BBBRRRRRRAAANGGGG! It would repeat every 45 seconds and I thought someone had a air tool and was working some hard sheet metal. Eventually I worked my way up the creek a couple hundred yards to where it crossed under the road. Perched on the wooden post on the bridge abutment barrier was a downy woodpecker hammering his brains out on the steel guardrail!!!
Every woodpecker species has a different cadence for their hammering. It is used as a territorial call, the louder and more often they hammer out their battle cry, the more dominant they are. This guy had figured out how to amplify his message! Apparently, he had studied psychological warfare!!!