A pair of giant panda cub twins play at Shanghai Wild Animal Park in Shanghai, East China, Oct 4, 2017. The panda twin cubs turned one year old on Oct 4. [Photo/Xinhua]

A pair of giant panda cub twins enjoy birthday feast at Shanghai Wild Animal Park in Shanghai, East China, Oct 4, 2017. The panda twin cubs turned one year old on Oct 4. [Photo/Xinhua]

Staff members carry a pair of giant panda cub twins at Shanghai Wild Animal Park in Shanghai, East China, Oct 4, 2017. The panda twin cubs turned one year old on Oct 4. [Photo/Xinhua]