Reprinted from a article on Newsner dated 05/22/2016
In 1995, the US Fish and Wildlife Service, along with Canadian biologists, captured 14 wolves in Canada and placed them in Yellowstone National Park, where they had been extinct since 1926. Over the next few years, the number of wolves rose, but that was the least of the changes that took place in Yellowstone.
The effects were more striking than anyone could have expected. The entire ecosystem of the national park transformed and it went so far that even the rivers changed. How could this have happened? Watch the clip and marvel at the amazing way in which nature works.
NOTE: There are “elk” pictured in this video when the narrator is referring to “deer.” This is because the narrator is British and the British word for “elk” is “red deer” or “deer” for short. The scientific report this is based on refers to elk so we wanted to be accurate with the truth of the story.