The Natural Treasures of Carolinian Canada: Discovering the Rich Natural Diversity of Southwestern Ontario is a recent resource book about the wealth of plants and animals indigenous to Southern Ontario. Each of the 11 chapters is written by naturalists and scientists with interests in the preservation of the ecoregion. The Carolinian zone habitats and ecosystems include forests, tallgrass prairies and savannas, wetlands, streams, shorelines and other aquatic habitats. The unique trees of this region include Sassafras, Cucumber Magnolia, Tulip-tree, Black Walnut, and Pawpaw. Three chapters of the book are devoted to the plants and trees of this system. Five chapters cover the mammals, birds, fish, butterflies and insects of the Carolinian region. The remaining three chapters are devoted to the ongoing care and stewardship efforts in the region. Of particular interest are Walpole Island First Nation and the Six Nations of the Grand River Territory. The book contains full-colour photographs of each page, maps, an index, and bibliography. This is a must-have book for anyone interested in the Ontario environment as well as school and public libraries.