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July 30 2013
The re-introduction of wolves to Yellowstone National Park in the United States has had an unexpected benefit – it has boosted the diet of a rival top predator, the grizzly bear.
Scientists have found that the berries on which grizzlies gorge themselves before winter have increased dramatically since wolves were re-introduced into Yellowstone in order to control the population of elk, which have seriously overgrazed the park over the past few decades.
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