The giant panda Tuantuan plays at the Taipei Zoo in Taipei, southeast China's Taiwan, May 6, 2019. At the Taipei Zoo, the two giant pandas Tuantuan (male) and Yuanyuan (female) have drawn large crowds eager to catch a glimpse of the chubby bears through the past ten years. The two giant pandas were sent to Taiwan from the Chinese mainland in late 2008. In 2013, Tuantuan and Yuanyuan had a baby called Yuanzai. (Photo: Xinhua)

The giant panda Yuanyuan plays at the Taipei Zoo in Taipei, southeast China's Taiwan, April 28, 2019. At the Taipei Zoo, the two giant pandas Tuantuan (male) and Yuanyuan (female) have drawn large crowds eager to catch a glimpse of the chubby bears through the past ten years. The two giant pandas were sent to Taiwan from the Chinese mainland in late 2008. In 2013, Tuantuan and Yuanyuan had a baby called Yuanzai. (Photo: Xinhua)

The giant panda Tuantuan plays at the Taipei Zoo in Taipei, southeast China's Taiwan, May 6, 2019. At the Taipei Zoo, the two giant pandas Tuantuan (male) and Yuanyuan (female) have drawn large crowds eager to catch a glimpse of the chubby bears through the past ten years. The two giant pandas were sent to Taiwan from the Chinese mainland in late 2008. In 2013, Tuantuan and Yuanyuan had a baby called Yuanzai. (Photo: Xinhua)

Tourists view the giant panda at the Taipei Zoo in Taipei, southeast China's Taiwan, May 6, 2019. At the Taipei Zoo, the two giant pandas Tuantuan (male) and Yuanyuan (female) have drawn large crowds eager to catch a glimpse of the chubby bears through the past ten years. The two giant pandas were sent to Taiwan from the Chinese mainland in late 2008. In 2013, Tuantuan and Yuanyuan had a baby called Yuanzai. (Photo: Xinhua)

The giant panda Tuantuan eats bamboo leaves at the Taipei Zoo in Taipei, southeast China's Taiwan, May 6, 2019. At the Taipei Zoo, the two giant pandas Tuantuan (male) and Yuanyuan (female) have drawn large crowds eager to catch a glimpse of the chubby bears through the past ten years. The two giant pandas were sent to Taiwan from the Chinese mainland in late 2008. In 2013, Tuantuan and Yuanyuan had a baby called Yuanzai. (Photo: Xinhua)

The giant panda Tuantuan plays at the Taipei Zoo in Taipei, southeast China's Taiwan, May 6, 2019. At the Taipei Zoo, the two giant pandas Tuantuan (male) and Yuanyuan (female) have drawn large crowds eager to catch a glimpse of the chubby bears through the past ten years. The two giant pandas were sent to Taiwan from the Chinese mainland in late 2008. In 2013, Tuantuan and Yuanyuan had a baby called Yuanzai. (Photo: Xinhua)