![Bar-headed geese are seen at Bande Lake on the Tuotuo River, the headwaters of the Yangtze River in northwest China’s Qinghai Province. The lake is home to a large number of bar-headed geese, one of the world\'s highest-flying birds. (Photo: China News Service/Tudandanba)](http://www.ecns.cn/hd/2018/07/04/066397d4a26e4f018d7eec6d6696c596.jpg)
Bar-headed geese are seen at Bande Lake on the Tuotuo River, the headwaters of the Yangtze River in northwest China’s Qinghai Province. The lake is home to a large number of bar-headed geese, one of the world's highest-flying birds. (Photo: China News Service/Tudandanba)
![Bar-headed geese are seen at Bande Lake on the Tuotuo River, the headwaters of the Yangtze River in northwest China’s Qinghai Province. The lake is home to a large number of bar-headed geese, one of the world\'s highest-flying birds. (Photo: China News Service/Tudandanba)](http://www.ecns.cn/hd/2018/07/04/7158cc3faaf742af801169fb4160da2b.jpg)
Bar-headed geese are seen at Bande Lake on the Tuotuo River, the headwaters of the Yangtze River in northwest China’s Qinghai Province. The lake is home to a large number of bar-headed geese, one of the world's highest-flying birds. (Photo: China News Service/Tudandanba)
![Bar-headed geese are seen at Bande Lake on the Tuotuo River, the headwaters of the Yangtze River in northwest China’s Qinghai Province. The lake is home to a large number of bar-headed geese, one of the world\'s highest-flying birds. (Photo: China News Service/Tudandanba)](http://www.ecns.cn/hd/2018/07/04/2c98107aeb71460898d2e40c8639b68b.jpg)
Bar-headed geese are seen at Bande Lake on the Tuotuo River, the headwaters of the Yangtze River in northwest China’s Qinghai Province. The lake is home to a large number of bar-headed geese, one of the world's highest-flying birds. (Photo: China News Service/Tudandanba)
![Bar-headed geese are seen at Bande Lake on the Tuotuo River, the headwaters of the Yangtze River in northwest China’s Qinghai Province. The lake is home to a large number of bar-headed geese, one of the world\'s highest-flying birds. (Photo: China News Service/Tudandanba)](http://www.ecns.cn/hd/2018/07/04/4bf4993c3704427f982cea169ff2a107.jpg)
Bar-headed geese are seen at Bande Lake on the Tuotuo River, the headwaters of the Yangtze River in northwest China’s Qinghai Province. The lake is home to a large number of bar-headed geese, one of the world's highest-flying birds. (Photo: China News Service/Tudandanba)
![Bar-headed geese are seen at Bande Lake on the Tuotuo River, the headwaters of the Yangtze River in northwest China’s Qinghai Province. The lake is home to a large number of bar-headed geese, one of the world\'s highest-flying birds. (Photo: China News Service/Tudandanba)](http://www.ecns.cn/hd/2018/07/04/a80c9c9c914a46d79ebc1d19792a719d.jpg)
Bar-headed geese are seen at Bande Lake on the Tuotuo River, the headwaters of the Yangtze River in northwest China’s Qinghai Province. The lake is home to a large number of bar-headed geese, one of the world's highest-flying birds. (Photo: China News Service/Tudandanba)
![Bar-headed geese are seen at Bande Lake on the Tuotuo River, the headwaters of the Yangtze River in northwest China’s Qinghai Province. The lake is home to a large number of bar-headed geese, one of the world\'s highest-flying birds. (Photo: China News Service/Tudandanba)](http://www.ecns.cn/hd/2018/07/04/ee6d9bf73f30424fa69f59a7af8618fd.jpg)
Bar-headed geese are seen at Bande Lake on the Tuotuo River, the headwaters of the Yangtze River in northwest China’s Qinghai Province. The lake is home to a large number of bar-headed geese, one of the world's highest-flying birds. (Photo: China News Service/Tudandanba)
![Bar-headed geese are seen at Bande Lake on the Tuotuo River, the headwaters of the Yangtze River in northwest China’s Qinghai Province. The lake is home to a large number of bar-headed geese, one of the world\'s highest-flying birds. (Photo: China News Service/Tudandanba)](http://www.ecns.cn/hd/2018/07/04/7f6ec188a2b3416584d70c3ac063771d.jpg)
Bar-headed geese are seen at Bande Lake on the Tuotuo River, the headwaters of the Yangtze River in northwest China’s Qinghai Province. The lake is home to a large number of bar-headed geese, one of the world's highest-flying birds. (Photo: China News Service/Tudandanba)