This inspiring exploration of tree hollows and the creatures that call them home is well-designed, beautifully written and bound to become an enduring reference book. The thoroughly researched information enriches readers’ understanding of the natural world and our potential role in preserving our wildlife by providing a comprehensive introduction to tree hollows, which are an important ecological feature for so many species. Detailed and varied information is sure to engage young readers by delving into the topic of hollows and explaining how they form and how animals use and depend upon them. Scientific information is presented in a simple and accessible way, with concepts and terminology well defined and explained. Vibrant illustrations, photographs, maps and diagrams complement the content and bring the information to life, and some fun and practical instruction on finding hollows and how to create a nesting box lend the book an interactive element. Profiles and interviews with scientists working in the area of wildlife conservation may even inspire further investigation into the subject. The book is a fun and informative peek into a hidden, yet vital part of nature.