Wolves in Yellowstone were not such a good idea now I can imagine being visited by lions, tigers or even rogue elephants. Where did I put the ammo for the 458?
Actually the wolves in Yellowstone have done wonders for the park. Without predators, the buffalo, and other herbivores, had the run of the place. As a result, no saplings could survive to maturity and a lot of undergrowth dissappeared. Other species depended on those plants for survival. When the wolves were reintroduced, the herbivores had to be careful of where they spent their time. Staying to long in certain locations gave a big advantage to the wolves. As a result, the herbivores were much more selective on where they grazed, for their own safety. Ther result was that more natural vegiation could take hold and that increased the biodiversity of other animals.
The bad part is that the wolves eventually wnader out of the aprk and start seeing cattle as a new food source.