Article Photos: Pa. zoo: Wild dogs killed boy who fell in exhibit 12/21

  Barbara Baker, CEO and president of the Pittsburgh Zoo and PPG Aquarium, gestures to indicate the slope of a railing that is in the observation area of the African Painted Dog exhibit during a news conference on Monday, Nov. 5, 2012, in Pittsburgh. Zoo officials said a young boy was killed after he fell into the exhibit and the dogs mauled him on Sunday, Nov. 4, 2012. (AP Photo/Keith Srakocic)