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Invasive Species in the United States

The African clawed frog has taken over Lily Pond in San Francisco's Golden Gate Park. Native to Kenya, the frogs eat almost anything and breed like crazy. They alter ecosystems by gobbling up insects, fish, and even birds.

The only way to prevent the species from spreading is to kill them, an expensive effort that would cost millions of dollars in cash-strapped California.

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Photograph copyright Tom Brakefield/CORBIS
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