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Legendary environmentalist Doug Peacock on what the removal of grizzlies from the Endangered Species li...

Revised Edition:
In the Shadow of the Sabertooth

Global Warming, the Origins of the First Americans, and the Terrible Beasts of the Pleistocene

In the Shadow of the Sabertooth

"In his new, substantially revised edition, famed wilderness defender, Doug Peacock, takes the reader on a profoundly new look at ice age global warming in North America, its effect on human colonization, extinction of the great American wildlife and the crucial survival lessons that can be applied to the current state of our rapidly changing climate. For the first time in popular scientific literature, Peacock uses recent evidence to reveal the two holy grails of American archaeology: The origins of the First Americans and the Clovis people."

There has been substantial revisions and much added material. The books original suppositions are now backed up by recent genetic research to explain origins of First Americans, Clovis extinction and the role of megapredators.

For the past 12,000 years, the earth has experienced a relatively stable climate. Today, that predictability has ended, and global warming is our new reality. Yet such shifting weather patterns threatened Homo sapiens once before, right here in North America as the continent was first being colonized. About 15,000 years ago, the weather began to warm, melting the glaciers of the Late Pleistocene and driving the beasts of the Ice Age toward extinction. In this new landscape, humans managed to adapt to unfamiliar habitats and dangerous creatures in the midst of a wildly fluctuating climate. Are there lessons for modern people lingering along this ancient trail?

Renegade naturalist Doug Peacock’s thrilling narrative explores the full range of climate change, from the death of the Pleistocene megafauna to the disappearance of today’s ice. In the Shadow of the Sabertooth is a deeply personal odyssey that follows Peacock from archeological digs in Michigan and Montana, to the tiger haunted forests of Siberia, along the wild coast of the Pacific Northwest, into the rugged arroyos of Mexico and the American Southwest.


In the Shadow of the Sabertooth is available from AK Press.
All Doug Peacock’s signed books are available for purchase from Elk River Books.
Read reviews from Amazon, Good Reads, Reader's Lane, and the Science Advisory Board.
Interview: Access Utah, Utah NPR, 10/22/13
Doug Peacock Looks into The Shadow of the Sabertooth, The Write Question, Montana Public Radio, 10/24/13
Tracking America's ice-age pioneers, High Country News, 2/17/14
Incontrovertible Evidence Proves the First Americans Came From Asia, The Daily Beast, 3/27/14
American Wilderness Faces the Firing Squad, The Daily Beast, 7/6/14


Don't Delist Grizzlies

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Grizzly Delisting News & Alerts


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Lectures, Films, Readings

Specialties: Grizzly bears, Edward Abbey, Global Warming, Pleistocene extinction, the 6th Great Extinction, First Americans, Threats to Wilderness, the Yellowstone Park ecosystem, Predators on the edge: Polar bears and wolverines.

2014 Winner

"In the Shadow of the Sabertooth" won the award for Best Science book at the 2014 High Plains BookFest in Billings, Montana
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In the News

Grizzlies 'Saved His Life' and Now He Works To Save Theirs
Jessica A. Knoblauch, Earthjustice, 11/13/17

Grizzlies Saved This Vietnam Vet’s Life. Now He’s Fighting To Return The Favor.
Chris D'Angelo, Huffington Post, 10/16/17

Open Season
An American icon finds itself caught in the crosshairs of an environmental, economic and spiritual battle upon its removal from the endangered species list.
Melissa Thomasma, Planet Jackson Hole, 8/23/17

Winging it in the Russian Far East
Doug Peacock, Sustainable Play, August 2017

Is Yellowstone's Grizzly Bear Population Doomed?
Doug Peacock, Men's Journal, June 2017

The Grizzly Man's Last Stand
Rick Bass, Men's Journal May 2017

Letter to President Obama
Download the letter (PDF)

Prominent Biologists Ask President Obama To Halt Grizzly Delisting
Montana Public Radio - 5/2/16

Jim Harrison and the Art of Friendship
The late, great author was generous with his time, his money, his talent, and his friendship. He made life better. He cannot be replaced.
The Daily Beast - 4/1/16

We’re Putting Grizzlies in the Crosshairs
A government proposal to remove the grizzly bear from the list of endangered species would surely condemn the species to almost certain slaughter.
The Daily Beast - 3/18/16

Op-Ed: Don’t Delist Yellowstone Grizzly Bears
The animals currently face two great threats to their survival: global warming, and the U.S. government.
Outside Online - 3/9/2016

What It Takes to Kill a Grizzly Bear
Yellowstone grizzly bears face the two greatest threats to their survival in our lifetime: global warming and the U.S. government. Between them they could wipe the bears out.
The Daily Beast - 11/23/14

Dangerous Idea: Save the Habitat for All Creatures - Wisconsin Public Radio - 11/16/14

Peacock: Wilderness Fight 'Not Getting Any Better' - Montana Public Radio - 10/20/14

Doug Peacock: Military Veterans And The Healing Wilderness On Access Utah - 9/16/14

Naturalist, author: 'Like a lot of veterans, I was out of sorts' - Billings Gazette - 9/12/14

Hayduke lives! Bottlenecks and books with author/naturalist Doug Peacock -
The Bozeman Magpie - 8/12/14

American Wilderness Faces the Firing Squad - The Daily Beast - 7/6/14

About Doug

Author, Vietnam veteran, filmmaker and naturalist Doug Peacock has published widely on wilderness issues: from grizzly bears to buffalo, from the Sierra Madres of the Sonoran desert to the fjords of British Columbia, from the tigers of Siberia to the blue sheep of Nepal. Doug Peacock was a Green Beret medic and the real-life model for Edward Abbey’s George Washington Hayduke in The Monkey Wrench Gang.

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