In the Valley of Wolves: Reintroduction of the Wolves
This informational text resource is intended to support reading in the content area. The reintroduction of wolves into Yellowstone has resulted in many changes in the ecosystem. Before the wolves were reintroduced, large elk populations destroyed aspen and willow trees, preventing their reproduction. Since wolves were reintroduced, elk have had to change their browsing behavior, allowing some vegetation to recover in certain areas. This has affected many other species, including beavers, birds, fish and insects.