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Invasive Species in the United States

One region's native species can be another locale's invader. Mute swans, like this pair pictured with eight offspring, or cygnets, are an aggressive invasive species on the Chesapeake Bay in the eastern United States.

There are now more than several thousand mute swans in the Maryland portion of the Chesapeake Bay.

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Photograph by Mary Hollinger, courtesy NOAA
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