Do woodpeckers peck on live trees?
Yes =3 hope I helped!
No they don't. They peck the holes looking for bugs to eat. They chip away sections of the bark and tree hunting for insects that live in the tree. Check out the article http://www.thecanadianencyclopedia.com/index.cfm?PgNm=TCE&Params=A1ARTA0008701 It contains a description of how and why woodpeckers drill the holes.