The reintroduction of wolves in Yellowstone National Park had a significant positive effect on the beaver population. Wolves preyed on elk, which had been overgrazing willow and aspen trees along streams. With fewer elk, the trees were able to grow back, providing a more suitable habitat for beavers. As a result, the beaver population increased, leading to the creation of more ponds and wetlands in the park. This in turn benefited a variety of other species, including birds, fish, and amphibians. Overall, the reintroduction of wolves helped restore balance to the ecosystem and improve biodiversity in Yellowstone.
