Hundreds of whooper swans fly across the Ertix River in northwest China’s Xinjiang Uyghur autonomous region, April 1,2015. As the weather gets warmer, ice on the river starts melting. A group of whooper swans arrived in Fuyun county to spend the spring.[Photo/Xinhua]

As the weather gets warmer, ice on the river starts melting. A group of whooper swans arrived in Fuyun county to spend the spring.[Photo/Xinhua]

As the weather gets warmer, ice on the river starts melting. A group of whooper swans arrived in Fuyun county to spend the spring.[[Photo/Xinhua]

Hundreds of whooper swans fly across the Ertix River in northwest China’s Xinjiang Uyghur autonomous region, April 1,2015. As the weather gets warmer, ice on the river starts melting. A group of whooper swans arrived in Fuyun county to spend the spring.[Photo/Xinhua]