Gr 3-5-This concisely written introduction focuses on a common type of beetle with the uncommon ability to produce cold light. The text describes the basic anatomy of all insects, general characteristics of beetles, special physical and behavioral characteristics of fireflies, their natural habitat, life cycle, diet, enemies, and defense mechanisms. It also identifies the specific chemicals that, when mixed with oxygen, create bioluminescence, and explains how the insects use this light to signal prospective mates. The text is well organized and clearly written. There are some minor omissions. Although the book describes the process of metamorphosis, the term itself is not used. Additionally, the species of most of the fireflies depicted are not identified either by common or scientific names. One or two good-quality color photographs or diagrams with informative captions appear on almost every page. This title falls between Sylvia Johnson's excellent Fireflies (Lerner, 1986), which offers more photographs and detail on metamorphosis, and Judy Hawes's simpler Fireflies in the Night (HarperCollins, 1991), illustrated with color drawings. Despite minor flaws, Walker's Fireflies will help fill a gap in this subject area.-Karey Wehner, San Francisco Public Library Copyright 2001 Cahners Business Information.