Acoustic biologists are scientists who study animal sounds. The groundbreaking research of three acoustic biologists studying whales, elephants, and birds, respectively, is engagingly presented in this accessible volume. Coming from diverse backgrounds, each of the scientists is clearly dedicated to his or her work, and the excitement they feel for their studies is palpable. A strong message of conservation pervades the text. The concluding chapter suggests that the field of bioacoustics is open to students who are eager for the fun and excitement, as well as the “hours of meticulous and often tedious scientific data analysis.” The many clear color photographs are well chosen, and the book’s excellent design adds to an appealing presentation of contemporary scientists on the job. (Ages 8-11)