Mammals
Early Mammals Were Thought to Be Small and Unseen in the Age of Dinosaurs. An Elephant-Sized Fossil Complicates That Story
At a time when proto-mammals and other creatures were getting smaller, this dicynodont bulked up with the thunder lizards
Weasel-Like Fossils Reveal Evolutionary Clues of the First Mammals
A protomammal known as <i>Kayentatherium</i> was discovered with 38 babies in 185-million-year-old rock
Major Disease Outbreak Strikes California Sea Lions
Leptospirosis afflicts sea lions on a semi-regular cycle, but warming waters and migrating fish could make the marine mammals more susceptible
The Bison Returns to the Great American Plains
After years of fierce debate, the West’s greatest symbol will again roam the countryside
Eating the Queen's Poop Makes Naked Mole-Rats Better Parents
Hive-minded naked mole-rats work together to care for the queen's offspring, and eating her poop gives them hormones to boost nurturing instincts
Earth Lost 2.5 Billion Years’ Worth of Evolutionary History in Just 130,000 Years
Even if humans curbed destructive actions within next 50 years, it would take between five to seven million years for mammal biodiversity to fully recover
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 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
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
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
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
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
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
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
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
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
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
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
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