How scientists know invasive nutria were likely introduced to California by humans

Cane toads are an example of an intentional species introduction turned invasive

In 1935, Australian scientists imported several hundred cane toads to hunt and eat beetles that were damaging sugar cane fields. However, the toads could not reach the bugs at the top of the plant or the grubs in the soil. Instead, they negatively affected native species populations as their numbers grew to over 2 billion.

View some of the most invasive species in US waters

Introduced in the late 1600s from Eastern Asia, the goldfish is considered the first invasive fish in North America. The venomous lionfish is safe to consume, but catching it is complicated by its reluctance to respond to hook-and-line-style fishing attempts.

The Indigenous people of the central Californian coast made many advancements

The Indigenous people of the central Californian coast made advancements in basketry, small stone tools, the use of shell beads as currency, and plank canoes for seafaring. In the years before European contact, their numbers reach 25,000 across 150 settlements.

The bison with mystery origins on California's Santa Catalina Island

Bison roam the 75 square-mile channel island of Santa Catalina about 25 miles south of Los Angeles in the Pacific. It's not clear exactly how they got there, but one theory says 14 of them were dropped off as part of a Hollywood film production. Generally beloved by the locals and vacationers, their numbers ballooned to nearly 600 but dwindled amid resource scarcity. What now? See the state of conservation efforts here.

Santa Barbara's Channel Islands revealed the oldest skeletal remains in North America

IN 1959, archaeologists found a human femur jutting out from a rock face on Santa Rosa Island. Using the then-new technology of radiocarbon dating, they measured the age of the remains at 13,000 years—the oldest in the continent.

California condors have been vaccinated against West Nile to protect their limited population

The condors became endangered in the 20th century primarily due to lead poisoning from consuming animals shot with lead bullet fragments inside them, so condors in captivity and in the wild are vaccinated against diseases including highly pathogenic avian flu and West Nile.

Environmental DNA monitoring can help detect the presence of invasive species

Genetic material that organisms deposit into water, soil, or air can be identified by analyzing samples from each environment, allowing land managers to more reliably detect and track organisms than visual surveys alone. eDNA has been used to develop early warning surveillance systems for various invasive marine species.

Hear from a NYC public health official who led the first US investigation into West Nile

This podcast walks through the investigation into the first US outbreak of West Nile, and how the virus had never been seen in the Western Hemisphere. The official discusses how she thinks the origin of West Nile in the US may have been birds or other animals that were brought here illegally.

Colorado legislates neural and biological data generated by the nervous system

The law expands personal privacy protections to include data from brain activity, marking the first legal step of its kind in the US. It targets companies involved in consumer neurotechnologies, which were previously not required to restrict user data access.

California is one of the world’s 35 biodiversity hotspots

The state comprises the hotspot known as the California Floristic Province, where roughly 3,000 species of vascular plants grow—roughly three-fifths of which are found nowhere else in the world (also known as endemic).

Lewis and Clark identified 122 animal species new to science

The Corps of Discovery recorded wildlife unknown to Americans, including grizzly bears, pronghorn antelope, and prairie dogs—offering the first detailed descriptions of the West’s diverse and often dangerous fauna.

Land use changes in Connecticut may have helped to enable Lyme's leap into humans

Forest clearing and fragmentation, alongside suburban development, may have contributed to the emergence of Lyme disease in humans in the 1970s. Those changes brought mice, carriers of the disease, into greater contact with people. Climate change is also facilitating Lyme's spread as tick populations survive milder winters and move northward.

Researchers are investigating if nanoparticle treatments could combat allergies

In rodent work, Northwestern University’s Evan Scott (now at the University of Virginia) and his colleagues have been trying to attack allergies with specially designed nanoparticles—miniscule lab-made objects that can penetrate cells. They stud the nanoparticles with a tiny bit of the allergen specific to the allergy (i.e. cashew protein for cashew allergy) and antibodies that shut down allergic response processes.

John Steinbeck's 'Sea of Cortez,' a travelogue through the Gulf of California, is still used by ecologists today.

The Golden State killer case spotlights how genetic testing can affect your—and your relatives'—privacy

Police managed to use consumer DNA test results to close a case 32 years after a killer was believed to have committed at least 12 murders and 50 rapes. Their "smoking gun": They compared a DNA sample from the crime scene to genetic data relatives had shared on an open-source genealogy database. The suspect was caught after investigators explored family trees on this database and connected the dots from over 100 distant relatives who had some percentage of DNA that matched the killer. (Some users may encounter a paywall.)

The Gold Rush helped turn Napa into wine country

In the 1830s, the arrival of settlers carrying European rootstock grapevines to Napa kick-started the valley's wine industry. Ten years later, the Gold Rush brought scores of wine-loving Europeans and their descendants to the area. Recognizing an opportunity, Charles Krug opened the valley's first commercial winery in 1861, which produces bottles to this day.

Side-by-side shots of once-dry California lakes now filled

In late 2022, much of California was in drought; by early 2023, after a series of downpours from atmospheric rivers, much of the state's reservoirs had been re-filled. See the dramatic difference in this series of photos.

The use of fungi to detoxify land and water—a process known as mycoremediation—has been used to clean up natural resources affected by the 2025 California wildfires.

The American cockroach is actually from Africa, an apparent hitchhiker aboard ships carrying enslaved people, with evidence suggesting the bug may have arrived in the New World as early as the 1600s.

Norway is responsible for salmon sushi

Japanese sushi did not include salmon until the mid-1990s because Pacific salmon was known to contain parasites. Norway, meanwhile, had an abundance of Atlantic salmon, which was safe to eat raw. The country smelled an opportunity and launched Project Japan, which successfully convinced the country that Atlantic salmon was safe to include in its cuisine.

An interactive investigation into drugs and migration in San Francisco

This interactive article investigates the connection between the boom in US migration from Honduras and drug dealing in San Francisco. A high concentration of Hondurans are fleeing Siria Valley, where poverty and national murder rates run high...

River dolphins manhandle an unlucky anaconda

The natural world around us is endlessly inspiring, and fascinating, and often very odd too: like when researchers snapped a photo of Bolivian river dolphins swimming around with a Beni anaconda snake in their mouths, for example.

The life of a pistachio

Pistachios—which are actually a seed, not a nut—are a superfood with lots of great fat, fiber, antioxidants, and more, and is listed as a complete protein. Originally from the Middle East, the seed was imported to the US where California has become the leading grower in the world. Harvested once a year around October, the flavor is having a bit of a moment both for its taste and nutrition. Watch more here.

Ten thousand mink got loose in Ohio

Vandalism freed thousands of mink at a rural northwest Ohio farm, leaving an estimated 10,000 of the small carnivorous mammals unaccounted for, according to the local sheriff.

How a worm helped give the southern US its reputation

"The germ of laziness" that blanketed the southern US for centuries with unshakable fatigue, brain fog, and distended bellies paired with emaciated frames was actually a worm. This parasitic worm lives in the gut, where it can stay up to five years, laying up to 10,000 eggs daily. Hundreds of millions of people worldwide continue to suffer from hookworm infections, often obtained by walking barefoot across infected soil.

Millions of honeybees are hauled yearly across the US to help pollinate farms

As indigenous pollinator populations dwindle, farmers increasingly rely on commercial honeybees, which truckers often transport during cooler periods to prevent die-off from overheating. Pollinating all the almond trees in California requires 85% to 90% of all honeybees available to pollinate in the country.

UC Santa Cruz's nontraditional mascot was selected by its students

After becoming an NCAA Division III school, UC Santa Cruz ditched its informal mascot, the banana slug, for a sea lion. Students protested and eventually held a straw vote to reinstate the old name, which they saw as an antidote to the hypercompetitive nature of college athletics.

Watch how viruses like Ebola can spill over from animals to humans—and vice-versa.

During the French Revolution, a botanist's letter asking about "dear Rhus" (poison ivy) was intercepted, leading authorities to suspect he was conspiring with the Russians.

Astronauts have repaired genetic damage in space using CRISPR—a molecular tool that can make precise changes to DNA and is used in single-celled organisms to attack invasive viruses.

The Great Salt Lake's distinct dual coloration results from high-salinity organisms that only live in the northern portion and produce a purple protein.

In 2018, 26-year-old missionary John Allen Chau was killed by tribesmen after attempting to reach and evangelize on India's isolated North Sentinel Island

See how each of the more than two million known species relates to each other—and to common ancestors—in this zoomable tree of life.

The name 'Silicon Valley' arose from the founding of Shockley Semiconductor Laboratory in Fairchild Semiconductor in 1956-57, founded near Stanford University in Palo Alto

While El Niño moves warm Pacific Ocean waters east along the equator, La Niña moves them west, shifting where rainfall will become more common for months.

When caught in the mouths of cardinal fish, seed shrimp release glowing, bioluminescent chemicals, which alert predators of the cardinal fish, prompting the shrimp's ejection.

Hookworm infection, though risky, may help fight certain autoimmune conditions by tamping down the immune system's inflammatory response.

'Shogun,' a 1980s TV series, helped popularize sushi in the US by stimulating an American interest in Japanese culture.

The first line of 'immortal' human cells, which can divide indefinitely and are used in scientific research, was nonconsensually taken from a Black woman.

Stanford built a Google Maps for the Roman Empire, revealing how much it cost to travel in the ancient world

In 1915, workers recovered a submarine-like vessel from the Chicago River, prompting fears of German espionage

At the beginning of the 20th century, a group of young men ate standard American food—replete with food additives like borax and formaldehyde—as part of government research to better understand food safety.

70 years ago today, city officials in Santa Cruz, California, banned rock 'n' roll to protect its youth from corruption after witnessing a 'provocative' concert the night before.

Planarian flatworms are small, aquatic worms with exceptional regenerative capabilities. When cut, the worms can regenerate multiple bodies in a matter of weeks.

Clever Hans was a 1900s horse that was believed to be able to solve math equations, tell time, and read and comprehend German, until a psychology student discovered how he got his answers.

Louisiana's 'Cancer Alley' is infamous for having some of the highest industrial pollution, toxic air emissions, and cancer risks in the US.

Waves off the coast of Nazaré, Portugal, can reach over 100 feet and are caused by the area's deep underwater canyon geography

Recent research found that the brain doesn't seem to massively rewire following amputation—upending earlier beliefs about the cause of phantom limb pain.

Netflix profits when you're not watching, and its movies are designed that way—read a detail-rich critical essay exposing lesser-known Netflix takes

The story of Dollree Mapp, whose legal challenge over her 1957 conviction for possessing "obscene material" led to a major strengthening of the Fourth Amendment