Early Action Key in War Against Invasive Species

Thousands of mute swans are wreaking havoc on the Chesapeake Bay.

Thousands of mute swans are wreaking havoc on the Chesapeake Bay, eating up native plants and pushing native animals out of the ecosystem. Corbis hide caption

itoggle caption Corbis
Thousands of mute swans are wreaking havoc on the Chesapeake Bay.

Thousands of mute swans are wreaking havoc on the Chesapeake Bay, eating up native plants and pushing native animals out of the ecosystem. Corbis hide caption

itoggle caption Corbis

Thousands of acres of American countryside are lost to zebra mussels, snakehead fish and other "invasive species" each year, but the war isn't over yet. NPR's John Nielsen has this report on small victories on the invasive species battlefield.

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