What is a tree? Why are they so important to life on Earth? How do they eat, breathe, grow, communicate, and regenerate themselves? How many different kinds of trees are there, and where do they live? In this beautiful little book, illustrated with rare old engravings and specially commissioned drawings, internationally renowned Finnish tree expert Professor Olavi Huikari takes us on an unforgettable journey deep into the secrets of these most majestic of Earth's life forms.