The Naturalist's Handbook is an activity book for children whose curiosity about nature cannot be satisfied simply by reading books. Lynn Kuntz presents 25 possible activities for studying nature first-hand. The writer discusses and encourages exploration of the world of nature, including plants, "little critters," "bigger critters," birds, and water. Each section gives suggestions for various exploratory activities. The "naturalist explorer" is encouraged to keep a "field journal," and is taught in the first section of the book how to do this. The illustrations are in the form of fun-filled cartoons, providing entertainment while leaving the real-life images of nature to be discovered by the young explorer.