If you ever needed a proof of how little it takes to drastically change not only the wildlife population but the actual geography of an area – you may want to see this.
In 1926, there were no longer wolves in Yellowstone, once the natural habitat of this species. Between 1977 and the re-introduction in 1995, there have been reliable reports of wolves being seen throughout the park.
Most of them were either lone wolves or pairs, probably only transiting.
In the mid-1990s, the scientists introduced just a few wolves to Yellowstone National Park, and that set off a chain of events more epic than anyone ever thought possible. Contrary to what you might expect, the wolves did not do any damage to an existing wildlife, but its variety INCREASED dramatically. 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.