For several reasons. One is to get the insects in the tree, another is to get the sap, another is to store food, generally for winter.
They do it to get food, they nutrients and other things from the tree
To get at an insect under the bark, they will listen for it boring or moving around and peck where the noise is to get at it.
To locate and get to an insect inside the tree
A woodpecker could peck no peckers because no woodpeckers would peck peckers.
Seven.
How much time wood pecker peck on a tree in a second
About 15 pounds
The cylindrical shape of a gutter spout looks like a tree branch to a woodpecker. The woodpecker is just looking for insects to eat.
Because a woodpecker pecker can
peck peck peck
no
They peck anything they see
The word woodpecker has three syllables. (wood-peck-er)
A woodpecker can peck 20 times a second.
Woodpeckers can peck at up to 150 times a minute.