Rodents and Shrews

The small mammal's foot in the fossil of the microraptor.

This 120-Million-Year-Old Dinosaur Fossil Had a Mammal Hiding in Its Stomach

The finding represents only the second recorded instance of a dinosaur consuming a mammal

More than 150 people die every day from synthetic opioids.

Scientists Create a Vaccine Against Fentanyl

Researchers hope the vaccine, which blocked the drug from entering rats’ brains, could help reduce overdoses in humans

The study found that the human particpants and rats jerked their heads in a similar rhythm as the songs played. 

Watch These Rats 'Dance' to the Rhythms of Mozart, Lady Gaga and Queen

Moving accurately to a song’s beat was long thought to be a skill unique to humans, but new research suggests rats can do it, too

As of June 15, the World Health Organization had recorded a total of 2,103 confirmed monkeypox cases in 42 countries. Pictured: a colorized transmission electron micrograph of monkeypox virus particles (green) cultivated and purified from cell culture

History of Now

What You Need to Know About the History of Monkeypox

Mired in misconception, the poxvirus is endemic in certain African countries but was rarely reported in Europe and the U.S. until recently

A taxidermied Cumulina holds a block of toy cheese.

The Mouse That Squeaked Its Way Into Scientific History

Forget Dolly the Sheep. The birth of a mouse named Cumulina 25 years ago launched a genetic revolution

Staff members from the Agriculture, Fisheries and Conservation Department in Hong Kong investigate a pet shop that was closed after hamsters tested positive for the coronavirus.

Covid-19

Hong Kong Will Cull Thousands of Hamsters and Small Animals After Delta Variant Was Detected in a Pet Shop

Though there is no evidence of domestic animals passing the disease to humans, officials say they are acting out of caution

A passenger in a white truck photographs several capybaras in a yard in a gated community in Tigre.

Rodents of Unusual Size Take Over Gated Community in Argentina

Weighing up to 175 pounds and growing to four feet in length, capybaras are reclaiming habitat that once was theirs in South America

A dozen rat carcasses with upturned bellies were found littered along the sand in Brooklyn's Canarsie Park.

Rat Carcasses Wash Ashore in New York City After Hurricane Ida

Flood waters from record rainfall overwhelmed the rodents and forced them out of their homes

This photomicrograph reveals shows a type of Enterococcus bacteria. Strains of Enterococcus are commonly found in the gut.

Fecal Transplants May Reverse Brain Aging in Mice

Older rodents showed improved cognition and behavior after receiving a microbiome refresh from younger rodents

A fox squirrel perched on part of an experiment designed to test its agility and decision-making. Researchers used peanuts to entice the rodents to participate.

New Research

Squirrels Use Parkour Moves and Savvy to Stick Tricky Landings

A new study finds these acrobatic rodents quickly weigh variables like bendy branches to figure out how to safely clear big distances high in the treetops

Rodents within the area undergo regular tests where officials trap them, anesthetize them, and comb them for fleas.

Chipmunks Test Positive for the Bubonic Plague in Several South Lake Tahoe Locations

Officials closed some recreational sites while the areas undergo eradication efforts

The ancient mammal Gobioconodon (right) squabbles with a therian mammal over a meal in the Late Cretaceous.

Other Mammals, Not Dinosaurs, Kept Our Ancestors Down

The asteroid impact that ended the Cretaceous gave our mammalian ancestors, the therians, an edge over their mammalian competitors

Mice pups were borne out of freeze-dried mice sperm that had been stored on the International Space Station for up to six years. Some of those mice and their offspring are pictured here.

After a Six-Year Sojourn in Space, Freeze-Dried Mice Sperm Produce Healthy Pups

Scientists say the finding supports the idea that genetic material can be shipped to other worlds to help establish a diversity of life

Genetic tests reveal that the Shark Bay mouse (pictured) from Shark Bay, Western Australia, is actually a living population of Gould's mouse, which had been thought to be extinct for more than a century.

New Research

Australian Mouse Presumed Extinct for More Than a Century Found Alive on Island

The living Shark Bay mouse turned out to be genetically identical to the formerly extinct Gould’s mouse

Experiments showed that pigs and mice can absorb oxygen through their rectums.

New Research

Anally Delivered Oxygen Kept Suffocating Pigs and Mice Alive in the Lab. Could the Method One Day Save Human Lives, Too?

The technique may provide doctors with a new way of providing supplemental oxygen for patients with failing lungs

A beaver peers out of a Hancock live trap after being captured by Molly Alves, a biologist with the Tulalip Tribe in Washington.

Scientists Are Relocating Nuisance Beavers to Help Salmon

When the rodents are moved from backyards to wild areas, they make their new watersheds better for fish

A new study found rat poison in the bodies of more than 80 percent of 133 dead bald and golden eagles from across the U.S.

New Research

Study Finds Rat Poison in Dead Eagles From Across the U.S.

More than 82 percent of 133 eagles tested had so-called anticoagulant rodenticides in their bodies

Researchers were first intrigued by the social structure of the mole rats in the 1970s because, like bees and termites, naked mole rats have a single-breeding queen and have non-breeding worker rats

Naked Mole Rats Speak in Dialects Unique to Their Colonies

The accent is influenced by each group's queen but can vary if the monarch is overthrown

A new study finds beaver-eating wolves alter the landscape in Voyageurs National Park in Minnesota by changing the number and distribution of beaver ponds.

New Research

Minnesota Wolves Are Eating Beavers and Reshaping Wetlands

A new study finds that when a wolf kills a beaver its abandoned dam falls apart and goes unoccupied for more than a year

This illustration shows one of the newly described species of stilt mouse, Colomys lumumbai, wading at the edge of a stream.

New Research

Two New Species of Semi-Aquatic Mice Identified in East African Rainforests

Mice from the genus Colomys stand on kangaroo-like feet to wade in shallow water and use their whiskers to find prey

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