: It traces the "conquest of Earth" by animals, discussing when they branched off from plants and how various traits like herbivory vs. carnivory emerged.
: Examines how pets today often serve to alleviate human loneliness, moving from being "outside" helpers to "family members".
The book is structured as a series of interviews that address the history of life from the emergence of the first animals to modern-day interactions.
: It touches on modern developments, such as the use of "dolphin doctors" for therapy and the ethics of animal organ transplants. Reader's Guide and Analysis