今天是世界湿地日。

Today is the World Wetlands Day.

作为湿地生态环境的重要“指示器”，大天鹅在某个湿地区域活动的数量多少，一定程度上反映了该区域湿地生态环境的好坏。

As an important "indicator" of wetland ecology, the number of Whooper swans in a certain  area reflects to some extent the ecological status .

大天鹅通常栖息于开阔的、水生植物繁茂的浅水水域。性机警、胆怯。除繁殖期外常成群生活，特别是冬季，常呈家族群活动，有时也多至数十至数百只的大群栖息在一起。

The Whooper swan usually inhabits open, shallow waters with lush aquatic plants. They are alert and timid. Except for the breeding period, they often live in flocks, especially in winter, often in family groups, and sometimes in large groups of tens to hundreds of swans.

每年大概有100多只大天鹅飞抵四川若尔盖湿地过冬，形成美丽的“天鹅湖”景观。

Every year, more than 100 whooper swans fly to The Ruoergai wetland in Sichuan for the winter, forming a beautiful "Swan Lake" landscape.