"[The book] provides, in a more convincing way than I have read anywhere else, an integrated account of the past extinction of megafauna, the impact of these losses on the modern world, and the present status and conservation of large mammals globally." --Adrian Lister, PLoS Biology

"Once & Future Giants beautifully connects the world as we know it to one that, on a geological scale, disappeared only yesterday. We still understand so little about the natural history of the animals that went extinct, and a nuanced view in which both humans and climate change played significant roles in the decline of many species is beginning to emerge, but, for the moment, Levy's book effectively states the case for those who want to heal ecological wounds thought to have been opened by prehistoric humans."
--Brian Switek, Wired

"In Once and Future Giants , Sharon Levy does a marvellous job of explaining the complex and competing theories behind these mass Pleistocene extinctions, while capturing the fervour and enthusiasm of the scientists who dedicate their lives to solving the mystery."
--Kat Austen, New Scientist

"It seems likely that human hunting played some part in many of these extinctions. In Once and Future Giants, biologist and journalist Sharon Levy lays out the evidence for this theory - and explores what this species drain can teach us now. The patterns and consequences of the Pleistocene die-offs can help us to predict how landscapes will change if we lose big mammals, and help us to spot warning signs of impending extinctions."
--Emma Marris, Nature

"The book tackles the often conflicting theories and research in such a way that lay readers can understand what scientists think happened in the past and what they see happening now. But the big question is whether we can reverse these trends. Levy outlines possible methods to save some of the living megafauna and rebalance ecosystems... Highly recommended for all interested readers."
--Library Journal
 
"In a series of fascinating discussions [Levy] breathes life into these long-extinct animals, introduces readers to important lessons to be learned from extinction events, and considers proposals for resurrecting Ice Age ecosystems...This well-written, general interest book on basic ecology will interest anyone concerned about the health of the environment and the importance of conserving dwindling wilderness resources." --Choice