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

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The introduction of wolves into Yellowstone had a significant impact on the ecosystem, leading to ecological changes involving numerous plant and animal species. For example, the presence of wolves led to a reduction in elk populations, which in turn allowed for an increase in vegetation growth and a shift in the behavior of other animals like coyotes and foxes. This is known as a trophic cascade and is a key example of how the addition or removal of a single species can have far-reaching ecological effects.

The Introduction of Wolves into Yellowstone National Park in 1991