The Dr. Kinsey of the penguin world is a New Zealand ornithologist named Lancelot Eric Richdale. For ten breeding seasons he watched colonies of yellow-eyed penguins (Megadyptes antipodes) on the coast of New Zealand's South Island. He made friends with the birds, attached identifying bands to their legs, and spied with a telescope upon their domestic affairs. In a new book, Sexual Behavior in Penguins (University of Kansas Press; $5), he tells what he learned about their lives and loves, "marriages" and "divorces."
Penguins, he found, are as proper as they look, and they are reasonably faithful mates. Most of their "marriages"...