Here you can see a video of a male of Great Spotted Woodpecker, looking for larvae underneath the bark of cut trunks, although the quality is not good is impressive the capacity to break the bark that have the Woodpeckers, mainly at the end of the video is possible to see the power with which it strikes, and the ability to look for the angles for strike.
This is the photo of the state in which it left the trunk.
In the north of the Iberian Peninsula it is possible to find seven species of Woodpeckers, Great Spotted and Green Woodpecker are commonest of them.