Meaning: This sentence describes the behavior of woodpeckers as they use their beaks to peck at the bark of trees.
Choice of Words: "Woodpeckers" are birds with strong beaks that they use to peck at trees. "Tap" means to hit something lightly and repeatedly. "Bark" is the outer layer of a tree's trunk. When woodpeckers use their beaks to hit the bark of a tree, we say they are tapping on the bark.