Please note: The Great Ape House will be closed to visitors on Thursday, April 3.
Due to technical difficulties, we cannot process online payments. Free Entry Passes are still available and visitors may purchase Parking Passes at the Zoo (subject to availability).
Each spring, the Northern Great Plains erupts with life as migratory birds return to build nests and raise their young. Smithsonian researchers are studying these grassland birds that nets in areas inhabited by prairie dogs.