A deposit is required. Like all Smithsonian facilities, the Zoo allows assistance animals. However, such animals must be removed from any area if they disturb Zoo animals. The Zoo occupies a hillside rising 180 feet above Rock Creek. More than three miles of paths slope downhill from the Connecticut Avenue entrance.
Some paths are quite steep and can be slippery when wet.
Steep-grade symbols mark difficult parts of the pathways. It is gently sloping in most places. The Valley Trail goes through the steepest part of the Zoo. Wheelchair users should be especially cautious. There are no assistive listening devices available.