Yancheng is a city in the n of Jiangsu. It's famous for its wetlands. The biggest wetland there has an aof more than 450, 000 hectares. It's a perfect s for many endangered birds. There are 590 kinds of insects and 490 kinds of p in the wetland. They p birds with enough food. As many as 379 kinds of birds live there, i red-crowned cranes. Every winter, up to 1, 200 red-crowned cranes stay there.
Wetlands are not only homes for birds and animals, they can also p disaster (灾害). For e , when there is too much rain, wetlands can hold water. Then there will be fewer f .
Scientists say we must protect our wetlands. If we don't, it will be i to see many endangered birds in the future.
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