[Photo by Wang Yuheng/for China Daily]

After finding she was in low spirits, workers at the park installed a swing for her. A television set was later set up to broadcast videos of the three pandas being raised at the park. The keepers hope the images of her old friends will help to comfort Sijia.

Meanwhile, the keepers also placed a fake panda, which is the same size as Meiqian, in Sijia's enclosure in attempt to ease the 8-year-old panda's loneliness.

To give Sijia a good living environment, Feng Guilin, a senior keeper at the park, and his colleagues spend at least three hours each morning cleaning the panda house.

All the waste must be taken out and burned to ensure no parasites survive.

Sijia now weighs more than 115 kg and is entering sexual maturity.

The park officials said they will try other ways to amuse Sijia as long as she is in their care.