Mammals first evolved at about the same time as dinosaurs, and their story is perhaps the more fascinating of the two—in part because it is also our own story. In this literate and entertaining book, eminent naturalist David Rains Wallace brings the saga of ancient mammals to a general audience for the first time. Using artist Rudolph Zallinger's majestic The Age of Mammals mural at the Peabody Museum as a frame for his narrative, Wallace deftly moves over varied terrain—drawing from history, science, evolutionary theory, and art history—to present a lively account of fossil discoveries and an overview of what those discoveries have revealed about early mammals and their evolution. In these pages we encounter towering mammoths, tiny horses, giant-clawed ground sloths, whales with legs, uintatheres, zhelestids, and other exotic extinct creatures as well as the scientists who discovered and wondered about their remains. We meet such memorable figures as Georges Cuvier, Richard Owen, Edward D. Cope, George Gaylord Simpson, and Stephen Jay Gould and learn of their heated disputes, from Cuvier's and Owen's fights with early evolutionists to present controversies over the Late Cretaceous mass extinction. Wallace's own lifelong interest in evolution is reflected in the book's evocative and engaging style and in the personal experiences he expertly weaves into the tale, providing an altogether expansive perspective on what Darwin described as the "grandeur" of evolution.

When people today hear “paleontology,” they immediately think of dinosaurs. But for much of the history of the discipline, dramatic demonstrations of the history of life focused on the developmental history of mammals. The Age of Mammals examines how nineteenth-century scholars, writers, artists, and public audiences understood the animals they regarded as being at the summit of life. For them, mammals were crucial for understanding the formation (and possibly the future) of the natural world. Yet, as Chris Manias reveals, this combined with more troubling notions: that seemingly promising creatures had been swept aside in the “struggle for life,” or that modern biodiversity was impoverished compared to previous eras. Why some prehistoric creatures, such as the saber-toothed cat and ground sloth, had become extinct, while others seemed to have been the ancestors of familiar animals like elephants and horses, was a question loaded with cultural assumptions, ambiguity, and trepidation. How humans related to deep developmental processes, and whether “the Age of Man” was qualitatively different from the Age of Mammals, led to reflections on humanity’s place within the natural world. With this book, Manias considers the cultural resonance of mammal paleontology from an international perspective—how reconstructions of the deep past of fossil mammals across the world conditioned new understandings of nature and the current environment.