This installment in the Science of Senses series (5 titles) provides a basic explanation of how the various organs dedicated to the perception of scents in the animal world function. Klepeis' narrative sometimes reads choppily, but in an incremental way, she builds systematic conceptual frameworks for each topic that new and younger readers will find easy to follow. In the third and final chapter, she discusses some of the distinctive ways humans use their sense of smell, such as in recalling certain memories. The bright color photos range from cute close-ups of cat and dog noses to less cute (if no less attention-getting) views of a star-nosed mole, a bull shark, and an African giant pouched rat at work sniffing out a land mine. Level-appropriate resources at the end include books, a website, and videos.