Readers will meet some of the world's most vulnerable animal species in the A True Book: The Most Endangered series, which takes a conservationist stance in its discussion of these creatures and the threats they face. Each four-chapter volume offers a succinct overview of the animal's key traits and habitat as well as the forces endangering its survival and efforts being undertaken to protect it. Both Elephants and Rhinos draw attention to the ivory trade, but Elephants also points to the elephant's importance as a keystone species, while Rhinos takes readers into South Africa's Rhino Orphanage. Crisp photos, maps, or charts appear alongside reader-friendly text, and several titles address the negative impact of poverty and human conflict on animal populations, giving added scope to the books. Finally, each closes with "The Big Debate," which poses a divisive issue related to its subject, and tips on getting involved with conservation and awareness. A nice big-picture resource for young researchers or animal advocates.