A rock-loving female orangutan named Rubih is suspected of going ape on the observation windows of her St. Louis zoo enclosure. The 7-foot-tall, triple-paned windows of 12-year-old Rubih the orangutan’s enclosure were replaced in mid-November with 3-inch thick acrylic ones. But zookeepers are now suspecting Rubih did the damage herself, forcing nearly $200,000 in repairs and the exhibit’s closure until later this month. They say the repairs were required after Rubih tapped or banged rocks repeatedly against four of the six windows for months. The zoo’s ape care team had taught her to bring rocks to them and be treated. But the ape kept banging on the windows with rocks when zookeepers weren’t around, presumably to get someone’s attention for a treat.