Feature: This text is considered the market standard. It is comprehensive, accurate, well-written and has an unsurpassed illustration program. The line drawings were created by Bill Ober, who is a medical illustrator and physician, and Claire Garrison.

Feature: Introductory zoology for a one or two-semester course. Emphasis is on the diversity of the animal kingdom and evolutionary adaptations.

Feature: Each chapter includes suggested Internet links for additional information on specialized topics.

Feature: Key pedagogical elements include: Chapter Prologues, Chapter Notes, Summaries, Review Questions, and Selected References.

Feature: Further integration of new co-author Helen I'Ansonm who focuses on revising and updating reproductive chapters; David Eisenhour and Susan Keene.