A bull chases after another during a bullfight in the torch festival of Yi ethnic group in Yi Autonomous County of Shilin, southwest China's Yunnan Province, July 30, 2013. Bullfighting which has enjoyed thousands of years' history is a significant activity in the torch festival. (Xinhua/Lin Yiguang)

Working staff pull back a defeated bull during the torch festival of Yi ethnic group in Yi Autonomous County of Shilin, southwest China's Yunnan Province, July 30, 2013. Bullfighting which has enjoyed thousands of years' history is a significant activity in the torch festival. (Xinhua/Lin Yiguang)

Audience watch bullfight show during the torch festival of Yi ethnic group in Yi Autonomous County of Shilin, Southwest China's Yunnan Province, July 30, 2013. Bullfighting which has enjoyed thousands of years' history is a significant activity in the torch festival. Photo: Xinhua

Working staff pull back a bull which chases after another defeated bull during the torch festival of Yi ethnic group in Yi Autonomous County of Shilin, Southwest China's Yunnan Province, July 30, 2013. Bullfighting which has enjoyed thousands of years' history is a significant activity in the torch festival. Photo: Xinhua

Working staff pull back bulls during the torch festival of Yi ethnic group in Yi Autonomous County of Shilin, Southwest China's Yunnan Province, July 30, 2013. Bullfighting which has enjoyed thousands of years' history is a significant activity in the torch festival. Photo: Xinhua

Working staff pull back a defeated bull during the torch festival of Yi ethnic group in Yi Autonomous County of Shilin, Southwest China's Yunnan Province, July 30, 2013. Bullfighting which has enjoyed thousands of years' history is a significant activity in the torch festival. Photo: Xinhua

Two bulls fight with each other in the torch festival of Yi ethnic group in Yi Autonomous County of Shilin, Southwest China's Yunnan Province, July 30, 2013. Bullfighting which has enjoyed thousands of years' history is a significant activity in the torch festival. Photo: Xinhua

Two bulls fight with each other in the torch festival of Yi ethnic group in Yi Autonomous County of Shilin, Southwest China's Yunnan Province, July 30, 2013. Bullfighting which has enjoyed thousands of years' history is a significant activity in the torch festival. Photo: Xinhua

Working staff pull back bulls during the torch festival of Yi ethnic group in Yi Autonomous County of Shilin, Southwest China's Yunnan Province, July 30, 2013. Bullfighting which has enjoyed thousands of years' history is a significant activity in the torch festival. Photo: Xinhua

Working staff pull back two fighting bulls during the torch festival of Yi ethnic group in Yi Autonomous County of Shilin, Southwest China's Yunnan Province, July 30, 2013. Bullfighting which has enjoyed thousands of years' history is a significant activity in the torch festival. Photo: Xinhua