The introduction of wolves into Yellowstone National Park in 1991 resulted in

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The introduction of wolves into Yellowstone National Park in 1991 resulted in ecological changes involving at least 25 species. These changes included an increase in the populations of herbivorous animals like elk, which then led to a decrease in the populations of vegetation they consumed. This in turn allowed for the return of some plant and animal species that had nearly disappeared from the area. The reintroduction of wolves also impacted the behavior of other animals in the ecosystem, such as coyotes and birds of prey. Overall, the reintroduction of wolves had a significant impact on the Yellowstone ecosystem.

The Introduction of Wolves into Yellowstone National Park in 1991