This wild hog from Hawaii was raised at the National Wildlife Research Center in Fort Collins, Colo. Feral pigs in the wild tend to eat anything containing a calorie — from rows of corn to sea turtle eggs, to baby deer and goats. Rae Ellen Bichell/NPR hide caption

toggle caption
Rae Ellen Bichell/NPR

Scientists Get Down And Dirty With DNA To Track Wild Pigs

  • Download
  • <iframe src="https://www.npr.org/player/embed/507475723/513857968" width="100%" height="290" frameborder="0" scrolling="no" title="NPR embedded audio player">
  • Transcript

Biologist Shaun Clements counts down the seconds before emptying a vial of synthetic DNA into a stream near Alsea, Oregon. Jes Burns/Oregon Public Broadcasting/EarthFix hide caption

toggle caption
Jes Burns/Oregon Public Broadcasting/EarthFix

Old World climbing fern on a tree island in the Everglades surrounds LeRoy Rodgers of the South Florida Water Management District. Environmentalists say it's one of the worst invasive species the state has faced in a long time. Amy Green/WMFE hide caption

toggle caption
Amy Green/WMFE

Invasive Fern In Florida Threatens To Take Down More Than Just Trees

  • Download
  • <iframe src="https://www.npr.org/player/embed/511218451/511267272" width="100%" height="290" frameborder="0" scrolling="no" title="NPR embedded audio player">
  • Transcript

A man carries a Nile Perch of about 175 pounds caught in a lake in Uganda. The huge fish — they can weigh up to 440 pounds — were introduced to several African lakes and have wiped out hundreds of local species. WALTER ASTRADA/AFP/Getty Images hide caption

toggle caption
WALTER ASTRADA/AFP/Getty Images

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

toggle caption
Wolfgang Kaehler/LightRocket via Getty Images

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

toggle caption
Courtesy of Bill Lea

On The Trail Of The Wily Wild Hog

  • Download
  • <iframe src="https://www.npr.org/player/embed/479584561/479613783" width="100%" height="290" frameborder="0" scrolling="no" title="NPR embedded audio player">
  • Transcript

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

toggle caption
Greg Allen/NPR

Hunting Snakes In The Everglades To Protect Native Species

  • Download
  • <iframe src="https://www.npr.org/player/embed/463343169/463371584" width="100%" height="290" frameborder="0" scrolling="no" title="NPR embedded audio player">
  • Transcript

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

toggle caption
Courtesy of Tiffany Yap

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

toggle caption
Courtesy of Kelsey Bailey, Natural History Museum of Los Angeles County.

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

toggle caption
Andrew Derksen/Florida Department of Agriculture/Reuters/Landov

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

  • Download
  • <iframe src="https://www.npr.org/player/embed/364945713/365516460" width="100%" height="290" frameborder="0" scrolling="no" title="NPR embedded audio player">
  • Transcript

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

toggle caption
Louisiana Sea Grant/Flickr

Fighting (Tasty) Invasive Fish With Forks And Knives

  • Download
  • <iframe src="https://www.npr.org/player/embed/340648935/341083642" width="100%" height="290" frameborder="0" scrolling="no" title="NPR embedded audio player">
  • Transcript