You usually see woodpeckers hanging onto the side of a tree.
Many woodpeckers have a black back with white sideways marks.
Some have red heads or yellow chests. To find them, listen for their pecking sound. Woodpeckers have special feet. Most tree birds have 3 toes going forward, and 1 going back. Woodpeckers are different, because 2 toes go forward and 2 go back.