When wolves were brought back to the Yellowstone National Park, they not only killed elk, but also changed their prey's behavior patterns.
Wolves were likely absent for many years before being reintroduced to Yellowstone National Park on January 12, 1995. Yellowstone is the oldest national park in the world. One of the most effective wildlife reintroduction initiatives in the US was started with this reintroduction.
Ranchers report financial expenditures related to wolves preying on livestock, a decline in deer and elk populations and hunting chances, and dangers to people's and animals' safety as some of the perceived negative effects.
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