When Hamilton Troll meets Elwood Woodpecker, Elwood has just discovered petrified wood the hard way. Sitting there with a headache, Hamilton learns who woodpeckers drill holes in wood and then determines that they should learn more about this stone-wood substance.
When they visit the beaver brothers they learn about Beaver dams as well as how beaver teeth are constantly growing and they get to take all of that knowledge, including how petrified wood is made, and in-turn teach it to the other forest animals.
This book makes the lessons easy to understand and children tend to not even realize how much they are learning when they read it. A great educational experience to take outdoors!