| | Authors' Note | p. ix |
| | Dr. House, Meet Doctor Dolittle | p. 3 |
| | Redefining the Boundaries of Medicine | |
| | New Hope for an Ancient Diagnosis | |
| | Scared to Death | p. 109 |
| | Pain, Pleasure, and the Origins of Self-Injury | |
| | The Feint of Heart | p. 19 |
| | Why We Pass Out | |
| | Why Animals Get Fat and How They Get Thin | |
| | Jews, Jaguars, and Jurassic Cancer | p. 31 |
| | Zoophoria | p. 87 |
| | Heart Attacks in the Wild | |
| | Fat Planet | p. 132 |
| | Roar-gasm | p. 55 |
| | Grooming Gone Wild | p. 159 |
| | An Animal Guide to Human Sexuality | |
| | Getting High and Getting Clean | |
| | Fear of Feeding | p. 176 |
| | Eating Disorders in the Animal Kingdom | |
| | The Koala and the Clap | p. 194 |
| | The Hidden Power of Infection | |
| | Leaving the Nest | p. 212 |
| | Animal Adolescence and the Risky Business of Growing Up | |
| | Zoobiquity | p. 234 |
| | Acknowledgments | p. 245 |
| | Notes | p. 249 |
| | Index | p. 293 |