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Video: How wolves change rivers

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Do yourself a favor and watch this video on how wolves change rivers. It will make you happy. It's also extremely informative, as it illustrates the extraordinary 'cascade' effect downward of this change from high on the food chain to every other part of Yellowstone National Park, when the extinct wolves were reintroduced after an absence of seventy years.

Read the rest of the story HERE:

At earthsky.org

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