At Ulva Island Bird Sanctuary on Stewart Island, New Zealand, a sign warned visitors in 2008 to check their bags. The fight against invasive predators continues. Wolfgang Kaehler/LightRocket via Getty Images hide caption

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Feral hogs in Great Smoky Mountains National Park are an invasive and hugely destructive species. Courtesy of Bill Lea hide caption

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On The Trail Of The Wily Wild Hog

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Fish and Wildlife Commissioner Ron Bergeron handles a snake as part of the Python Challenge in the Everglades. Greg Allen/NPR hide caption

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Hunting Snakes In The Everglades To Protect Native Species

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The Ensatina salamander, a lungless species common along the U.S. West Coast, is one of hundreds of species of salamanders endemic to North America threatened by an emerging infectious pathogen. Courtesy of Tiffany Yap hide caption

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Welcome to America! Before it was spotted in Los Angeles, the fruit fly species Drosophila gentica had been seen only in El Salvador back in 1954. Courtesy of Kelsey Bailey, Natural History Museum of Los Angeles County. hide caption

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Giant African land snails, like this one found in Florida in 2011, eat almost any plant. Florida officials are determined to eradicate the invasive pest. Andrew Derksen/Florida Department of Agriculture/Reuters/Landov hide caption

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Florida's Hunt For Giant Snails Leads To 'Smelly Easter Eggs'

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Asian carp, battered and fried. As the fish makes its unwelcome way up the Mississippi River, chefs are trying to get people to eat to beat it back. Louisiana Sea Grant/Flickr hide caption

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Fighting (Tasty) Invasive Fish With Forks And Knives

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Commercial fisherman Ronnie Hopkins (left) and his assistant, Armondo, catch Asian carp on Lake Barkley, Ky. Paul Rister/AP hide caption

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Carp(e) Diem: Kentucky Sends Invasive Fish To China

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A Russian sow on Mark Baker's farm. Four other parties have joined Baker's lawsuit against the Michigan Department of Natural Resources. Courtesy of Long Haul Productions hide caption

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Battle Over Michigan's New Swine Rules Goes Hog Wild

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