Mammals

An artist's impression of the shrew-like Krusatodon kirtlingtonensis, which a new study suggests lived long and matured slowly, in contrast to modern small mammals.

Two Rare Jurassic Skulls Could Help Unlock the Secrets of Mammals' Evolutionary Success

Fossils reveal a prehistoric, mouse-like creature matured slower and lived longer than similar mammals of today

A rhesus macaque on Cayo Santiago, which is less than a mile east of Puerto Rico. Rhesus macaques spend upwards of 20 percent of their time engaged in cooperative behaviors like grooming.

How Do Animals Change Their Social Habits as They Age?

In patterns that may sound familiar, long-term studies reveal what elderly deer, sheep and macaques are up to in their twilight years

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How to Sweat Like an Olympian

This summer, don’t be embarrassed by those pit stains or your drenched workout clothes. Our expert on the science of sweat says perspiration is what makes humans faster, higher and stronger

Two chimpanzees at the Budongo Conservation Field Station in Uganda

Chimpanzees Take Turns in Fast-Paced Conversations, Just Like Humans Do

A new study finds the average chimpanzee response time in gestured conversations is 120 milliseconds, which isn’t that far from the human average of 200 milliseconds

The remains of whales that sink to the ocean floor become biological oases. Since 1977, scientists had only identified about 50 such whale falls across the world’s oceans, but a recent effort uncovered a startling density of them off the coast of Los Angeles.

Why Have So Many Whale Remains Been Found on the Ocean Floor Near Los Angeles?

Scientists have discovered more whale falls there than in the rest of the world combined

DOC ranger Jim Fyfe and Māori ranger Tūmai Cassidy walk alongside a cetacean, thought to be a rare spade-toothed whale, being transported by Trevor King Earthmoving.

The World's Rarest Whale May Have Just Washed Ashore in New Zealand

No one has ever recorded a live sighting of the spade-toothed whale, but experts say the dolphin-like creature found earlier this month is "no doubt" a member of the elusive species

Baby beluga whales and adults alike spend the summer in the Churchill River.

Watch Chatty Beluga Families Migrate With These Stunning Live Cams in Canada

Polar Bears International and Explore.org are once again capturing video footage and audio recordings of the social marine mammals as tens of thousands congregate in the Churchill River this summer

Scientists believe the mammoth was so well-preserved because of the dry, cold climate in Siberia.

3D DNA Preserved for 52,000 Years in Freeze-Dried Woolly Mammoth Remains

For the first time, researchers have mapped ancient genetic material in unprecedented detail

Asteroid impacts and volcanism have led to mass extinctions on our planet.

Has Life on Earth Survived More Than Five Mass Extinctions?

Scientists aren’t just arguing whether humans are causing a sixth mass extinction event now, but whether many more occurred in the past

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

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

Ranchers and landowners consider dingoes pests, while conservationists say they are vitally important to Australia's ecosystem.

Ancient DNA Unravels the Mysteries of the Dingo, Australia's Wild Dog

Researchers dove into thousands of years of evolutionary history, revealing new insights about the iconic, though sometimes vilified, canines

Winged Life Winner

View 11 Breathtaking Images From the BigPicture Photography Competition

This 2024 showcase of life on Earth shines a light on some of our planet's most amazing species and places

A baby musk ox stands with an adult in the Arctic.

The Quest to Resurrect a Lost Ecosystem in Siberia

A father-and-son team of scientists are trying to revive ancient grasslands by reintroducing large grazers

Yun Chuan is "serious about his bamboo but mild-mannered toward others," according to the San Diego Zoo.

Two Pandas Arrive at the San Diego Zoo, the First to Enter the U.S. in 21 Years

For months, the only pandas in the country had been in Atlanta. Next, San Francisco and Washington, D.C., are expected to also receive pandas this year

Tusks and other fossilized remains are all that's left of the woolly mammoths that lived on Wrangel Island thousands of years ago.

What Killed the Last Woolly Mammoths? Scientists Say It Wasn't Inbreeding

New research suggests some catastrophic event—such as a natural disaster or a virus—killed the world's last known population of mammoths on Wrangel Island

Spinner dolphins swim in the Red Sea. Research has shown some dolphins are shy, while others are extroverted.

Five Amazing Dolphin Behaviors, Explained

From calling each other by name to using tools, these social creatures are a lot like us

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

The two Hudson Bay polar bear groups are often considered indicators of how the 17 other polar bear subpopulations will fare in the future.

Time Is Running Out for the Hudson Bay Polar Bears

The southern and western subpopulations are on track to disappear as sea ice becomes too thin amid rising global temperatures

The white bison calf and its mother were spotted in Yellowstone National Park.

Rare White Bison Calf Born at Yellowstone National Park

A photographer spotted the calf on June 4. White buffalo are sacred to some Native American tribes, and the birth has been called a "blessing and a warning"

Newly examined fossils suggest monotremes—egg-laying mammals—were once much more abundant in Australia than they are today.

Meet the 'Echidnapus,' an Extinct Creature That Resembles Both the Echidna and Platypus of Today

The species is among three newly identified monotremes, or egg-laying mammals, discovered from fossils in Australia that are shedding light on the odd animals' evolution

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