Lawrence D. Igl Douglas H. Johnson Marriah L. Sondreal Christopher M. Goldade Jason P. Thiele Betty R. Euliss Jill A. Shaffer 2019 <p>The key to Northern Harrier (<i>Circus hudsonius</i>) management is providing tall, dense vegetation in extensive mesic or xeric grasslands or in wetlands. Northern Harriers have been reported to use habitats with 15–106 centimeter (cm) average vegetation height, 28–75 cm visual obstruction reading, 24–53 percent grass cover, 18–25 percent forb cover, less than or equal to 2 percent shrub cover, 3–5 percent bare ground, 23–30 percent litter cover, and 2–6 cm litter depth. </p> application/pdf 10.3133/pp1842L en U.S. Geological Survey The effects of management practices on grassland birds—Northern Harrier (<i>Circus hudsonius</i>) reports