具体描述
Imagine it has been nearly two hundred years since hunters killed the last of the trumpeter swans living in the eastern part of North America. Now that the birds are protected by law, scientists hope to return the birds to their former range in the East. However, trumpeter swans must learn their migration routes from their parentsso scientists are taking on the role of parent swans in the Trumpeter Swan Migration Project, teaching cygnets to follow ultralight aircraft in an effort to reintroduce a migrating population to the Atlantic coast.
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