This thorough revision of the 2nd edition (2004) spans three full-color volumes and covers endangered and threatened mammals, birds, reptiles, amphibians, fish, mollusks, insects, arachnids, corals, crustaceans, and plants. This 3rd edition, featuring 38 new species, reflects changes in the endangered and threatened status of the 242 species profiled. Each entry provides the species common/scientific names, classification information, and current status according to the International Union for Conservation of Nature and Natural Resources (IUCN) and the Endangered Species Act, description, location, reason for endangerment, and measures being taken to protect it. Entries are divided into sections by classes; entries within each class are arranged alphabetically. Color photographs and maps add visual context; some entries include sidebars on related subjects. A glossary, subject index, bibliography, classroom projects and activities section, and critical thinking questions round out the set.