A breeder feeds a rescued elephant Yang Niu in Xishuangbanna, southwest China's Yunnan Province, Aug. 12, 2018, the World Elephant Day. (Photos: Xinhua)

Rescued elephant Yang Niu (L) enjoys the fruit birthday cake at its three-year-old birthday party in Xishuangbanna, southwest China's Yunnan Province, Aug. 12, 2018, the World Elephant Day.

Elephants enjoy a special fruit feast at the Wild Elephant Valley scenic spot in Xishuangbanna, southwest China's Yunnan Province, Aug. 12, 2018, the World Elephant Day.

Elephants go on a parade at the Wild Elephant Valley scenic spot in Xishuangbanna, southwest China's Yunnan Province, Aug. 12, 2018, the World Elephant Day. A parade and a special fruit feast were held here to celebrate the World Elephant Day. (Xinhua/Xie Ziyi)

A parade and a special fruit feast were held here to celebrate the World Elephant Day.

Elephants go on a parade at the Wild Elephant Valley scenic spot in Xishuangbanna, southwest China's Yunnan Province, Aug. 12, 2018, the World Elephant Day.

Volunteers color the elephant statues at the Wild Elephant Valley scenic spot in Xishuangbanna, southwest China's Yunnan Province, Aug. 12, 2018, the World Elephant Day.

Volunteers prepare fruit birthday cake for rescued elephant Yang Niu in Xishuangbanna, southwest China's Yunnan Province, Aug. 12, 2018, the World Elephant Day.

A parade and a special fruit feast were held here to celebrate the World Elephant Day.

Elephants enjoy a special fruit feast at the Wild Elephant Valley scenic spot in Xishuangbanna, southwest China's Yunnan Province, Aug. 12, 2018, the World Elephant Day.