A sika deer is seen at Qushui zoo in Lhasa, southwest China's Tibet Autonomous Region, Nov. 23, 2017. From oxygen generation, temperature control to humidification, various methods have been implemented to accommodate animals to plateau conditions at the zoo. (Xinhua/Chogo)

Alpacas are seen at Qushui zoo in Lhasa, southwest China's Tibet Autonomous Region, Nov. 23, 2017. From oxygen generation, temperature control to humidification, various methods have been implemented to accommodate animals to plateau conditions at the zoo. (Xinhua/Chogo)

Peacocks are seen at Qushui zoo in Lhasa, southwest China's Tibet Autonomous Region, Nov. 23, 2017. From oxygen generation, temperature control to humidification, various methods have been implemented to accommodate animals to plateau conditions at the zoo. (Xinhua/Chogo)

A lynx is seen at Qushui zoo in Lhasa, southwest China's Tibet Autonomous Region, Nov. 23, 2017. From oxygen generation, temperature control to humidification, various methods have been implemented to accommodate animals to plateau conditions at the zoo. (Xinhua/Jigme Dorje)

A wolf is seen at Qushui zoo in Lhasa, southwest China's Tibet Autonomous Region, Nov. 23, 2017. From oxygen generation, temperature control to humidification, various methods have been implemented to accommodate animals to plateau conditions at the zoo. (Xinhua/Chogo)

A breeder works at Qushui zoo in Lhasa, southwest China's Tibet Autonomous Region, Nov. 23, 2017. From oxygen generation, temperature control to humidification, various methods have been implemented to accommodate animals to plateau conditions at the zoo. (Xinhua/Jigme Dorje)

Peacocks are seen at Qushui zoo in Lhasa, southwest China's Tibet Autonomous Region, Nov. 23, 2017. From oxygen generation, temperature control to humidification, various methods have been implemented to accommodate animals to plateau conditions at the zoo. (Xinhua/Zhang Rufeng)

Deers are seen at Qushui zoo in Lhasa, southwest China's Tibet Autonomous Region, Nov. 23, 2017. From oxygen generation, temperature control to humidification, various methods have been implemented to accommodate animals to plateau conditions at the zoo. (Xinhua/Zhang Rufeng)

Zebras are seen at Qushui zoo in Lhasa, southwest China's Tibet Autonomous Region, Nov. 23, 2017. From oxygen generation, temperature control to humidification, various methods have been implemented to accommodate animals to plateau conditions at the zoo. (Xinhua/Jigme Dorje)

Alpacas are seen at Qushui zoo in Lhasa, southwest China's Tibet Autonomous Region, Nov. 23, 2017. From oxygen generation, temperature control to humidification, various methods have been implemented to accommodate animals to plateau conditions at the zoo. (Xinhua/Zhang Rufeng)