Visitors to the Edinburgh Zoo had their final chance to see and bid farewell Thursday to a pair of popular giant pandas who are returning home to China after more than a decade in Scotland. Yang Guang and Tian Tian are leaving in early December after a 12-year stay. Washington’s National Zoo sent its three pandas — Mei Xiang, Tian Tian and their cub, Xiao Qi Ji — to China earlier in November.