In 1995-1996 gray wolves were re-introduced to Yellowstone National Park. Since then all of the following have occurred, except

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The re-introduction of gray wolves to Yellowstone National Park has resulted in several ecological changes such as the remains of elk killed by wolves becoming food for grizzly bears, wary elk no longer trampling regrowth of aspen, cottonwoods, and willow trees, shade trees growing along streams encouraging larger trout populations, and wolves reducing predatory coyote populations, increasing small mammals. However, the disappearance of beaver dams from streams is not a result of the gray wolf re-introduction, but rather a consequence of other factors such as human activity and climate change.

In 1995-1996 Gray Wolves Were Re-Introduced to Yellowstone National Park