Zookeepers tracked the "lion" through the park Monday as zoo goers watched.
Zoo staff set up makeshift fences to contain the wild beast. If it was not a drill, the animal would be shot with a tranquilizer and quickly moved back to its cage habitat.
The annual costumed rehearsal is a favorite spectacle for zoo goers. Last year, the zoo practiced capturing a man dressed as an escaped polar bear.
All of the drills have been successful, zoo officials.