Strutz Strutz:
This article made me laugh as we were woken up early this morning to one of these fellas pecking away at the siding of our building between our living room windows and the neighbors. tat-tat-tat-tat-tat... It was so annoying. My bf got up and tried to scare it away from the deck but the pecker just ignored him. So he got a small glass of water and tossed the water at the bird who flew away. 10min later he returned and resumed pecking. So another glass of water. 10min later back he was. Third time seemed to be the charm as he hasn't returned yet.
Spraying vinegar on the wood being pecked is often enough to keep the birds away.