Just as it is in the public interest to have systems of corridors for the movement of vehicles, oil, gas, electrons, and water, it is in the public interest to have a system of corridors for wildlife. Wildlife corridors are for mammals large and small that must walk to where they need to go.

Over the course of more than a century, Congress—or the executive branch using expressed authorities granted by Congress—has established various systems for the conservation, management, and enjoyment of federal and other lands and waters. On the whole, these systems are bold, visionary, and remarkable.