This video from the USA says about itself:
15 May 2016
Northern Flickers use real man-made steel drums – metal chimney caps – that makes them intelligent “tool-users” and likely among the loudest woodpecker drummers in the world. But loud doesn’t begin to describe what the 15-minute long drumming and calling sessions sound like inside the house whose chimney top is used as a drum. Enjoy this short documentary and imagine what this sounds like at the break of dawn as a male Northern Flicker defends his territory, mate and nest box!
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