Invasive Species

We're gonna need a bigger tank.

Ginormous Goldfish Are Invading Australian Rivers

Abandoned by their owners, the fish run rampant and impact the environment

An Insect Could Make Ash Baseball Bats a Thing of the Past

The invasive emerald ash borer is threatening the forests where Rawlings and Louisville Sluggers come from, putting the bats in jeopardy

EU Releases Its First Invasive Species Blacklist

Gray squirrels, raccoons and crayfish were among the prohibited species

What's the Difference Between Invasive and Nonnative Species? Plus, More Questions From Our Readers

You asked, we answered

Venomous Lionfish Invade the Mediterranean

A recent survey shows that the fish have colonized Cyprus and may continue to spread

Invasive kudzu girdles a forest.

The Global Price of Invasive Species

The U.S. and China pose the greatest threat as exporters of invasive species, but other countries have more to lose

Nile Crocodiles Have Moved to Florida

Three "unusual" crocodilians turned out to be more closely related to South African crocs than American ones

Brawny American Lobsters Are Muscling in on Their European Cousins

Sweden wants to ban live American lobsters for fear they will out-claw their own

Argentine ants

Invasive Ants Could Be Beaten Back With a Targeted Virus

The idea is sound, but work needs to be done to ensure the virus doesn’t take out other insects as well

Invasive Rabbits Change the Soil so Drastically you Can See the Effects Decades Later

Remote French islands in the Indian Ocean have a bunny problem

Ten years on, some of the scars that Katrina tore into coastal ecosystems persist, while others have healed. NASA's Landsat 8 satellite captured this image of the swamps and marshes that buffer New Orleans in August 2015.

How Hurricane Katrina Redrew the Gulf Coast

While storms here are nothing new, human influence helped Katrina make Louisiana’s ecological problems worse

Jumping worms are becoming more common in Wisconsin. This photo shows what is likely an Amynthas agrestis jumping worm in Pennsylvania, though its identification is unconfirmed.

Jumping Worms Have Invaded Wisconsin

A wriggling worm is becoming a problem in the Midwest

Pet goldfish in a tank, where it belongs

Pet Goldfish Released into the Wild Are Getting Really Huge

Monster goldfish are trouble for native fish

An emerald ash borer, the problem the wasp is supposed to address

Colorado Hopes This Asian Wasp Can Save its Trees

Researchers are hoping to use one non-native species to fight another, more destructive one

Hammerhead sharks off the coast of Cocos Island, Costa Rica. The island is known for its incredible terrain and marine life, and is said to be the inspiration for Isla Nublar, the place Michael Crichton created as the setting for Jurassic Park—and now Jurassic World.

Where to Visit the Real Jurassic World After You See the Film

The movie's filming locations and inspiration offer lush vegetation, stunning views and plenty of sharks

Colorado Lake Teems with Feral Goldfish

Parks and Wildlife thinks a goldfish owner dumped his pets into a local lake. Now a few years later, the fish swarm the water in thousands

The Children’s Book That Caused Japan’s Raccoon Problem

When the story of one man’s childhood pet raccoon became a hit in 1970s Japan, it heralded a biological invasion still troubling the country today

The tropical fire ant is the first known ant to travel the world by sea.

How 16th Century Trade Made Fire Ants an Early Global Invader

By inadvertently stowing away in Spanish ships, one pesky little insect quickly spread throughout much of the world

A yellow crazy ant

Invasive, Acid-Spraying Ants in Hawaii Are Deforming Native Seabird Chicks

The ground-dwelling chicks are pestered by invasive ants spraying acid

A wallaby in the mist on the Irish island of Lambay.

What the Heck Are Wallabies Doing in Ireland?

Normally spotted in Australia, the marsupial species is thriving on a remote island off the Irish coast

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