
The natural history of North America's Great Lakes.

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These five giant lakes drain a massive watershed bordering Canada and the United States which contain 20 percent of the world's surface freshwater.
How winter has shaped life in the Great Lakes; a polar vortex paralyzes fish and ducks attract hundreds of bald eagles while wolves hunt a deer trapped by ice, but are manipulated by ravens.
A look at how beavers and wolves interact changing the water and how loons, owls, moose, bears and millions of people depend upon these lakes many take for granted.