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Invasive Species

Hikers spotted the creature at the 10,882-acre Joseph D. Grant County Park last week.

A Large, Invasive Lizard Was Spotted in a California Park

Hikers at Joseph D. Grant County Park, just outside of San Jose, saw an Argentine black and white tegu last week—and rangers are now searching for the out-of-place reptile

Burmese pythons—like this one photographed at Everglades National Park—are decimating animal populations in South Florida.

Florida Bobcat Kills 13-Foot Python for the First Time on Record. It’s a Sign of Nature ‘Fighting Back’ Against the Invasive Snakes

Burmese pythons are wreaking havoc on the Everglades ecosystem, but some native animals have been known to prey on the enormous reptiles

Argentine black and white tegus (Salvator merianae) were brought to the United States in the 1990s by exotic pet traders. They've since proliferated in the wild and been deemed an invasive species.

Mysterious Fossil Found in Museum Storage Turned Out to Be a New, Extinct Lizard Species

Today, tegus are considered invasive creatures in Florida, but a new paper suggests they’ve lived in the southeastern United States at least once before—millions of years ago

Chinese mitten crabs had never been found in the Pacific Northwest, until now.

Invasive Crab With Furry, Mitten-Like Claws Detected for the First Time in the Pacific Northwest

A commercial fisherman nabbed a large male Chinese mitten crab in the lower Columbia River late last month, putting biologists on high alert

A female Guam kingfisher (left) and a male (right) perch on a branch on Palmyra Atoll.

Biologists Rejoice as Extremely Rare Guam Kingfishers Lay Their First Wild Eggs in Nearly 40 Years

The brightly colored birds are extinct in the wild, having disappeared from their native Guam in 1988 due to the introduction of the invasive brown tree snake. But now, they’re starting to make a comeback on Palmyra Atoll

Northern snakeheads were first discovered in American waters in 2002.

These Large, Snake-Like Fish Are Invading the United States—and Authorities Want You to Kill Them

Invasive northern snakeheads can “walk” on land, breathe air and survive out of water for several days, and they also compete with native species in waterways

In hopes that they could control destructive cane beetles, people introduced cane toads to Australia in 1935. Instead, the amphibian's population exploded, and today, cane toads number roughly 200 million.

Scientists Create Gene-Edited ‘Peter Pan’ Tadpoles That Could Control Invasive Cane Toads Through Cannibalism

To combat one of Australia’s most troublesome species, researchers are developing hungry tadpoles that never grow up

Nutria have voracious appetites for vegetation, leading them to destroy wetland ecosystems.

The U.S. Fish and Wildlife Service Wants You to Eat These Giant, Invasive Rodents

As part of National Invasive Species Week, the agency is calling on Americans to “eat the invaders,” including swamp-dwelling nutria

Fossilized feces, also known as coprolites, are helping scientists in New Zealand peer back in time.

Fossilized Poop Reveals How Extinct, Flightless Birds Helped Spread New Zealand’s Colorful Fungi

The upland moa was likely drawn to the fungi because of their resemblance to berries, scientists say, allowing the creature to fill a role typically played by mammals

The endangered Woodville Karst cave crayfish (Procambarus orcinus)

Freshwater Animals Are More Fragile Than Thought, With Nearly a Quarter Threatened With Extinction, Study Finds

Species in Lake Victoria, Lake Titicaca, Sri Lanka’s Wet Zone and the Western Ghats of India are particularly vulnerable to the effects of agriculture, human infrastructure and climate change, per the paper

More than 1,300 tiny snails were released into the wild after a captive breeding effort. One baby snail is shown here on a British five pence coin.

Once Feared Extinct, 1,329 Pea-Sized Snails Have Been Released on an Atlantic Island After Captive Breeding Effort

Goats, rodents and habitat loss threatened the snails on Deserta Grande Island, so the mollusks were reintroduced on a neighboring island that’s free of invasive species

Southern sea otters are making a comeback along the coast of California—and they're chowing down on invasive European green crabs.

Hungry Sea Otters Are Taking a Bite Out of California’s Invasive Crab Problem, New Study Finds

Researchers estimate southern sea otters eat up to 120,000 European green crabs per year at the Elkhorn Slough National Estuarine Research Reserve

The invasive northern giant hornet, also called a murder hornet, has been eradicated from the United States.

Officials Declare the U.S. Free of ‘Murder Hornets’ in a Rare Victory Against an Invasive Insect

Five years after the first sighting in Washington state, intense efforts have eradicated the bee-killing hornets from the nation

The golden mussel is an invasive freshwater bivalve recently discovered near the Port of Stockton in California. 

Invasive Mussels Recently Spotted in California Mark a First for North America

The species may have been carried to the Sacramento–San Joaquin Delta in ballast water on ships

The crowning glory of the Gardenia brighamii is its pearly flower.

Can Fungi Save This Endangered Hawaiian Tree?

By inoculating greenhouse na’u seedlings with mycorrhizal fungi, researchers hope to boost survival odds when the plants are returned to the wild

The European ant species Lasius emarginatus arrived to Manhattan around 2011 and has since become one of the most dominant ant species in the city.

Invasive ‘ManhattAnts’ Are Taking Over New York City and Spreading Quickly

Since appearing on Manhattan in 2011, the species has become one of the island’s most dominant ants, and scientists formally identified it this year

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There's More to That

The Wild Story of What Happened to Pablo Escobar’s Hungry, Hungry Hippos

Ever since the demise of the infamous drug kingpin, his pet hippos have flourished, wreaking havoc on the ecosystem and terrorizing local communities

A hippo crosses a rural road near Doradal, Colombia. Experts say that left unchecked the hippo population could grow to 1,400 by 2040.

Pablo Escobar’s Abandoned Hippos Are Wreaking Havoc in the Colombian Jungle

Decades ago, the drug baron smuggled the beasts into South America for his private menagerie. They’ve been multiplying ever since. Now officials are taking extreme measures to counter the problem

ArTreeficial is a solar-powered, self-cleaning, artificial-intelligence-driven “tree” that entices the spotted lanternfly and eliminates the bug using an electronic mesh.

This High Schooler Invented an A.I.-Powered Trap That Zaps Invasive Lanternflies

Using solar power, machine learning and her family’s patio umbrella, 18-year-old Selina Zhang created a synthetic tree that lures the destructive species

Joro spiders aren't particularly bothered by the vibrations of a busy city environment.

Joro Spiders, Spreading in the Southeast, Can Survive Surprisingly Well in Cities

Unlike most spiders, the hustle and bustle of urban areas doesn’t seem to disturb the non-native Joros, a new study finds

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