How wolves changed the rivers in Yellowstone park

It must have been about 12-13 years since my last visit to the Yellowstone National Park. My first visit to the park in 1992 has been a memorable trip. Not only because of the great fishing but especially the awe inspiring surroundings. My amazement of the diversity of the scenery and wildlife has never been more profound as the day I drove into the park. Watch this video for an amazing tour of the park from above.

Here's an interesting yet very intriguing little documentary on how the re-introduction of wolves in the Yellowstone National Park changed the entire ecosystem and even the rivers as well.

We all know what happens when man introduces an unknown spices (like rabbits in Australia) in to an ecosystem. The wolves have been absent in the park for more than 70 years. Just shortly after the reintroduction of the wolves in the park, the effects were remarkable.