Panda twins Meng Yuan and Meng Xiang at the Berlin Zoo together with their mum Meng Meng. Photo by Peng Dawei, China News Agency

Panda Meng Yuan, which was born in Berlin, plays at the Berlin Zoo, May 10. Photo courtesy of the Berlin Zoo

Panda twins Meng Yuan (R) and Meng Xiang (L) play at the Berlin Zoo. Photo courtesy of the Berlin Zoo

Panda twins Meng Yuan (front) and Meng Xiang (rear) play at the Berlin Zoo. Photo courtesy of the Berlin Zoo

Panda twins Meng Yuan (above) and Meng Xiang (below) play at the Berlin Zoo. Photo courtesy of the Berlin Zoo

Panda twins Meng Yuan and Meng Xiang at the Berlin Zoo together with their mum Meng Meng, May 10. Photo courtesy of the Berlin Zoo.