A friend that lives in Richmond,CA (just north of Oakland) has had troblems with both male and females camping and bathing in the creek ravine behond their property. Ii is about 20-30 feet deep. They yell in the middle of the night disturbing sleep. Yesterday, during the day they encountered a male that had broken through their fence (which is located at age top of the ravine He had taken some stuff and when confronted, he took a shovel they had in the yard and hit her in the face. She just had bruises and is OK. I suggested they install razor wire on the outside and top of the fence.