Article Photos: Pa. zoo: Wild dogs killed boy who fell in exhibit 16/21

  A teddy bear rests at the post of a sign near the entrance to the parking lots for the Pittsburgh Zoo and PPG Aquarium on Monday, Nov. 5, 2012, in Pittsburgh. Zoo officials said a young boy was killed after he fell into the exhibit that was home to a pack of African painted dogs who pounced on the boy and mauled him on Sunday, Nov. 4, 2012. (AP Photo/Keith Srakocic)