The Woodpeckers is a wonderful introduction to the world of bird study for the young naturalist, covering such topics as how he finds food, courting, how he builds his nest, the interesting ways he uses his different body parts as tools, among other topics discussed in the book.
If you wish to investigate further, the online text has a few diagrams and an Appendix that contains more technical information such as detailed descriptions of the different species of North American woodpeckers which were not read as part of this audiobook.