Polar bear cub "Yilina" plays in the Ocean Aquarium of Penglai in east China's Shandong Province, Feb. 18, 2017. "Yilina", a female polar bear born in the aquarium in Dec. 19, 2016, has grew to 50 cm in length and 5 kg in weight. (Xinhua/Chu Yang)
Polar bear cub "Yilina" plays in the Ocean Aquarium of Penglai in east China's Shandong Province, Feb. 18, 2017. "Yilina", a female polar bear born in the aquarium in Dec. 19, 2016, has grew to 50 cm in length and 5 kg in weight. (Xinhua/Chu Yang)
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