Giant panda Si Jia plays at a panda house in Yabuli township, northeast China’s Heilongjiang province, Nov 24, 2016. Born in southwest China’s warm Sichuan province, the two adult pandas, 8-year-old You You and 10-year-old Si Jia, embraced their first freezing winter in northeast China.[Photo/Xinhua]

Giant panda Si Jia plays at a panda house in Yabuli township, northeast China’s Heilongjiang province, Nov 24, 2016. Born in southwest China’s warm Sichuan province, the two adult pandas, 8-year-old You You and 10-year-old Si Jia, embraced their first freezing winter in northeast China.[Photo/Xinhua]

Giant panda Si Jia plays at a panda house in Yabuli township, northeast China’s Heilongjiang province, Nov 24, 2016. Born in southwest China’s warm Sichuan province, the two adult pandas, 8-year-old You You and 10-year-old Si Jia, embraced their first freezing winter in northeast China.[Photo/Xinhua]

Giant panda Si Jia plays at a panda house in Yabuli township, northeast China’s Heilongjiang province, Nov 24, 2016. Born in southwest China’s warm Sichuan province, the two adult pandas, 8-year-old You You and 10-year-old Si Jia, embraced their first freezing winter in northeast China.[Photo/Xinhua]

Giant panda Si Jia plays at a panda house in Yabuli township, northeast China’s Heilongjiang province, Nov 24, 2016. Born in southwest China’s warm Sichuan province, the two adult pandas, 8-year-old You You and 10-year-old Si Jia, embraced their first freezing winter in northeast China.[Photo/Xinhua]