These clear books are full of questions, colorful photos, maps, and charts. The books’ emphasis is on the animals’ biological and intelligence abilities. They examine the animals’ social organization, memory abilities, emotions, verbal/non-verbal communications, use of tools, susceptibility to human diseases, and ability to learn skills. In addition, primary sources are quoted. The questions are geared toward higher thinking skills and encourage involvement in caring for the declining population of these animals. Recommended.