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The famed Craighead twins, wildlife biologists both, discovered in their years of studying Yellowstone's grizzlies that the bears typically wander up to a thousand square miles--meaning that even that huge park does not provide enough forage within its boundaries to ensure their survival in lean years. A Y2Y corridor of safe passage would offer animals like the grizzly ample room to roam, as well as clear migration routes to lessen the chance of extinction due to inbreeding. Already changes are taking place with such knowledge in mind, like the construction of animal bridges over major roadways. But the region's vastness also guarantees multiple private, public, and bureaucratic hoops to jump through in the conservation effort.
As a book, Yellowstone to Yukon is a thoughtful primer on the landscape and its wild denizens. Striking color pictures and maps accompany narrative text up to National Geographic's usual standards, guiding readers through 2,100 miles of the "most intact collections of wildlife in the world." --Jenny Burritt
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