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Mammals

Feast your eyes on the blind Somalian cavefish, which has—like mammals—mysteriously lost the ability to use light to fix damaged DNA.

Blind Cavefish Shed Light on the Dark Days of Mammalian Evolution

Like mammals, these cave-dwelling creatures have discarded a solar-powered system that repairs UV-damaged DNA

Sloths' slow-paced lifestyle is a survival strategy, not a sign of laziness

Sloths Don’t Just Live in Slow-Mo, They Can Put Their Metabolism On Pause

Unlike most mammals, sloths don’t use vast amounts of energy when it’s hot, instead opting to slow down and conserve power, more like birds or reptiles

Trending Today

Five Baby Squirrels Saved From Truly Knotty Predicament

Five gray tree squirrels in Wisconsin were found with their tails hopelessly knotted together, requiring some help from a wildlife rehab

A jaw of an Eoconodon coryphaeus—a house cat-sized omnivore that lived between about 66 and 63 million years ago—that Williamson collected in the San Juan Basin.

Nuclear Technology May Help Bring Early Mammal Evolution Into Focus

Using a neutron scanner at Los Alamos, paleontologists are generating high-resolution imagery of early mammal fossils

These wrinkly rodents continually surprise researchers.

How Eating Poop Makes These Mole-Rats More Motherly

New research suggests a colony’s queen stimulates babysitters by transferring a type of estrogen through her feces

Two tacos, extra ghost pepper sauce, please!

New Research

Tree Shrews Love Hot Peppers Because They Don’t Feel the Burn

A genetic mutation prevents Chinese tree shrews from feeling the heat of capsaicin, making them the only other mammal besides humans that enjoys hot foods

New Research

Coral Reefs Need Fewer Rats and More Bird Poo

A study of rat-infested islands in the Chagos show that a lack of seabirds—and their guano—degrades surrounding coral ecosystems

This scrotal male certainly isn't sheepish.

New Research

The Earliest Mammals Kept Their Cool With Descended Testicles

But if free-swinging sperm sacs are the norm, then why did undescended ones evolve four separate times?

Do Marine Mammals Yawn and More Questions From Our Readers

You asked, we answered

Why People Believed Hippos Were Related to Whales

Hippos were once believed to be related to whales. They’re both mammals, they both sleep underwater, and they both rise to breathe in their sleep

I can haz more habitats?

New Research

The UK’s Hedgehogs (and Other Mammals) Are In Danger

The island nation’s mammal populations have seen a steep decline in the last two decades, with hedgehog numbers decreasing by two-thirds

You'd expect to see a raccoon snuffling around at midnight. A sun bear, not so much.

New Research

Fear of Humans Is Forcing Daytime Animals Into Night Mode

The stress is pushing some animals to adjust their schedules—but not all will be quick enough to adapt

Don't judge a bat by its cover ... of Barry White.

New Research

Like Birds, Some Bats Warble to Woo Their Mates

They join an elite club of mammals—including mice, whales and humans—whose melodies convey complex information

The team’s findings compared the estimated visual acuity, or sharpness, of about 600 species.

How Does Your Vision Compare to Other Critters in the Animal Kingdom?

A new review of visual acuity compares the sight of 600 species, from mosquitoes to eagles

First Yellowstone Grizzly Hunt in 40 Years Will Take Place This Fall

In a controversial move, Wyoming will allow a limited take of the once-endangered species

Scimitar-horned oryx can go for ten months without drinking water.

Future of Conservation

Smithsonian Researchers Are Bringing the Oryx Back to the Wild

Reintroducing the species back to north-central Africa shows early signs of success

New Research

Hundreds of Blue Whales Are Permanent Residents Off New Zealand’s Coasts

Survey and genetic data show the whales of South Taranaki Bight are a unique population of non-migratory blue whales

Can Bringing Back Mammoths Help Stop Climate Change?

Scientists say creating hybrids of the extinct beasts could fix the Arctic tundra and stop greenhouse gas emissions

A San Quintin kangaroo rat at rest in the field.

Cool Finds

This Kangaroo Rat Was Just Spotted For the First Time in 30 years

A native to Baja California, the San Quintín kangaroo rat hopped back into researchers’ lives last summer

“Tattooed Whale, 2016” by Tim Pitsiulak. Screen-print on Arches Cover Black.

Why Scientists Are Starting to Care About Cultures That Talk to Whales

Arctic people have been communicating with cetaceans for centuries. The rest of the world is finally listening in

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