This is what happened in Yellowstone National Park in 1995. The wolves were extinct here since 1926. So the U.S. Fish and Wildlife Service, along with Canadian biologists, caught 14 wolves in Canada and placed them in the park. Over the next few years, the numbers rose, however, more changes took place in Yellowstone.
No-one could have foretold the changes that would occur. The entire ecosystem and rivers of the park were transformed. How is this possible? You will be amazed when you watch the clip below.
Please share this video with your friends so that more people can see this unbelievable change in nature.