Gr 3-6 The wide variety of types, sizes, colors and habitats of bats is clearly presented and substantiated. Major topics include ``Bats Around the World,'' ``Bats and People'' and ``Mothers and Babies.'' The importance of bats as pest controllers and plant pollinators is explained. A strong conservation message is presented in the final chapter which discusses, among other problems, the uses of pesticides, tourists upsetting normal bat behavior and the loss of natural habitats. The black-and-white photographs are clear, unusual and truly distinguished. The recent research makes this book more current than Nina Leen's The Bat (Holt, 1976), which is densely illustrated, and Miriam Schlein's Billions of Bats (Lippincott, 1982), which is not as detailed in its coverage. Bats is an indispensable source of information on the only mammal ``at home in the air.'' Elisabeth LeBris, Kenilworth Public School System, Ill.