This book explores the important, but often overlooked, role of females in evolution. Citing many recent studies, Kevles details and discusses how females participate in courtship and mating, give birth, care for offspring, and cooperate with other females. Most of her examples are from the literature on birds and mammals, and she wisely admonishes readers not to appropriate ``patterns that come from . . . animals as imperatives for human actions.'' Unfortunately, this otherwise well and thoughtfully written book is marred by a number of editorial and factual errors: e.g., king penguins do not have folds of skin on their feet for egg incubation. Nevertheless, given the timeliness of the topic and the dearth of books on it, this is recommended for both academic and public libraries. Nicholas J. Volkman, Point Reyes Bird Observatory, Stinson Beach, Cal.