Can you tell which woodpecker is knocking before the end of the reel? Woodpeckers drum to communicate. Drumming patterns can vary in pattern and length. Keep an ear out for a drumming woodpecker next time you're outdoors! Do woodpeckers fascinate you? Be sure to check out our newest self-paced, online course: https://academy.allaboutbirds.org/product/the-wonderful-world-of-woodpeckers/ | Cornell Lab of Ornithology