I went to the zoo with my wife who is in a motorized wheel chair. We stopped to visit the Tiger in his large cage and he immediately started to “stalk” her from about 40 yards away. This culminated in him attacking the chain link fence between us and him to get to her. Someone pointed out the sign that says “if the animal starts to act agressively toward a person in a motorized chair, please back away slowly, and leave the area.” He followed us around the cage until she was out of his sight.