Adrian Wydeven spreads his feet, tips his head back, and howls long and low into the summer night. His mimicry is perfect – plaintive, mournful, stirring. As the last notes fade into the Wisconsin woods, he waits, listening for a reply from the wolves he knows are near. As a timber wolf biologist from Wisconsin’s Department of Natural Resources (DNR), Wydeven and his colleagues trap, radio collar and monitor wolves in remote areas of northwestern Wisconsin. During the day, they check traps and track animals by telemetry; at night they howl.