By 1935, hunting and trapping had eliminated wolves from the United
States except for Alaska. Wolves have since been protected as an endangered species and have moved south from Canada and have reestablished themselves in the Rocky Mountains and the northern Great Lakes region. A few years ago, conservationists reintroduced wolves into Yellowstone National Park. Describe and explain in some detail the important role of wolves in a well-balanced wild ecosystem. Details of symbiotic relationships here are important.