Someone had to ask.

"What's that racket?"

https://www.npr.org/2024/05/31/g-s1-1606/woodpeckers-bang-metal-homes-loud-urban-noise-mating

"But when they bash away at metal, 'what the birds are trying to do is make as big a noise as possible," he said, "and a number of these guys have found that — you know what? If you hammer on metal, it's really loud!'

Woodpeckers primarily do this during the springtime breeding season, and their metallic racket has two purposes, 'basically summarized as: All other guys stay away, all the girls come to me,' McGowan said. 'And the bigger the noise, the better.'"

~ Sacha Pfeiffer