A sign to inform visitors about African Painted Dogs is seen near an observation area during a press tour near the overlook platform where a boy fell into the exhibit that was home to a pack of African painted dogs at 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 and the dogs mauled him on Sunday, Nov. 4, 2012. (AP Photo/Keith Srakocic)

Associated Press
A sign to inform visitors about African Painted Dogs is seen near an observation area during a press tour near the overlook platform where a boy fell into the exhibit that was home to a pack of African painted dogs at 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 and the dogs mauled him on Sunday, Nov. 4, 2012. (AP Photo/Keith Srakocic)
A sign to inform visitors about African Painted Dogs is seen near an observation area during a press tour near the overlook platform where a boy fell into the exhibit that was home to a pack of African painted dogs at 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 and the dogs mauled him on Sunday, Nov. 4, 2012. (AP Photo/Keith Srakocic)
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