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Mammals

Many rodents have nails on their thumbs and claws on the rest of their fingers. A new study suggests this trait might have been key to their world domination.

Rodents Conquered the World With the Help of Their Thumbnails, Study Suggests

The trait might have given rodents greater manual dexterity, allowing them to access new foods, such as nuts

Researchers studied genetic samples from 483 mammoths, including from their tusks, bones, skin and molars (shown here).

Scientists Investigate the Bacteria That Colonized Extinct Mammoths—and Uncover the Oldest Known Microbial DNA From a Host

Some of the microbes might have been benign or helpful, while others could have caused deadly diseases

Many different types of animals, from birds to orcas, are affected by human noise.

Five Dramatic Ways Animals Respond to Human Noise, From Mimicking Car Alarms While Wooing Mates to Calling Higher Over the Din of Traffic

As human-caused sound gets louder around the world, some animals change their behavior and many creatures suffer health issues

An aardvark emerges from its burrow.

Could Aardvark Burrows Be Ground Zero for the Next Pandemic?

Animals of all kinds mix and mingle in the underground refuges, offering troubling opportunities for diseases to jump species

Yagi (left) and Quinn (right) are searching for evidence of critically endangered Sumatran rhinos in Indonesia's Way Kambas National Park.

Two Sniffer Dogs Might Have Just Found a Lost Population of Critically Endangered Rhinos

Yagi and Quinn identified scat that was likely left by a Sumatran rhinoceros in Indonesia’s Way Kambas National Park, where scientists thought the animals had disappeared

Bison graze near the north entrance of Yellowstone National Park in Gardiner, Montana.

Restoring Bison to Yellowstone Has ‘Reawakened’ the Ecosystem as the Large Animals Migrate, Study Suggests

An analysis of plant diversity and soil health across the bison migration corridor suggests free-roaming bison lead to more nutrient-rich plants

Researchers often observed a family of bats roosting together in tight "cuddle balls."

These Big, Meat-Eating Bats Also Have a Cuddly Side. Rare Videos Reveal ‘Hugging,’ Playing and Sharing Food

Scientists observed a family of four spectral bats in their roost in a tree in Costa Rica, capturing an inside look at their social behavior

Early whales walked on land and swam in the shallows to hunt.

Before Whales Took to the Sea, These Ten Species Walked on Land

The creatures, which ranged in size from that of a fox to more than 50 feet long, divided their time between the coast and the water

This rabbit's "horns" are made of keratin, which is also found in hair and nails.

Rabbits With ‘Horns’ Seen in Colorado Are Going Viral. Here’s What’s Really Happening

Though the strange growths on these animals may look intimidating, experts say there’s not much to worry about, and they’re caused by a fairly common virus

Novaculadon mirabilis is characterized by its razor-sharp teeth.

A Student Spotted a Jawbone at a Beach. It Turned Out to Be a New, Mouse-Sized Mammal That Lived Among Dinosaurs

The species was named for its pointy teeth and could shed light on early mammal adaptations

An illustration of a mother and calf Janjucetus dullardi, a newly discovered tiny whale species with a sharp bite

Cool Finds

Newly Discovered Prehistoric Whale Is ‘Deceptively Cute’—It’s Tiny but Has a Mouth Full of Razor-Sharp Teeth

Found on the southern coast of Australia, the species could fill gaps in scientists’ understanding of baleen whale evolution

Several species have evolved in response to human environmental impacts.

Five Astounding Ways Humans Are Driving Animal Evolution, Including Causing Lizards to Grow Longer Legs and Leading Moth Populations to Become Darker

When people build cities and introduce invasive creatures, resident critter populations sometimes adapt

Artist illustration of a pack of Borophagus secundus

What Happened to the Bone-Crushing Dogs That Once Hunted Across North America?

Before going extinct roughly two million years ago, canids known as borophagines took down and consumed much larger prey

Boston terriers are said to be affectionate with human family members, good with children and playful.

Smithsonian Photo Contest Galleries

Celebrate Man’s Best Friend With These 15 Photographs of Good Dogs

Delight in dogs with snapshots from the Smithsonian Magazine Photo Contest

Aspen trees are making a comeback at Yellowstone National Park.

Reintroduced Wolves Are Helping Baby Aspen Trees Flourish in Northern Yellowstone for the First Time in 80 Years, Study Suggests

The apex predators, restored to the park in 1995, appear to be keeping the local population of plant-eating elk in check, which allows aspen saplings to grow tall and healthy

Feral cats have made their home on Fire Island.

Why Fire Island Has Seen an Explosion of Feral Cats

In New York’s only federal wilderness area, the loss of a key predator has led to the rise of a new one—with dire consequences for the island’s native birds

The remotely controlled robotic rabbits have been placed at various undisclosed locations in South Florida to see how well they fool the invasive snakes.

‘Robo-Bunnies’ Are the Newest Weapon in the Fight Against Invasive Burmese Pythons in Florida

Scientists are experimenting with robotic rabbits in hopes of luring the destructive snakes out of hiding so they can be euthanized

Researchers working in the Peruvian Amazon have discovered an unusual partnership between the ocelot (left) and opossum (right).

Video Reveals an Unlikely Bond Between Ocelots and Opossums in the Amazon, Walking Together Like ‘Old Friends’

Researchers captured the footage by surprise, with cameras initially set up to record bird behavior

Ancient sloths lived in trees, on mountains, in deserts, in boreal forests and on open savannas. Some grew as large as elephants.

Giant Sloths and Many Other Massive Creatures Were Once Common on Our Planet. With Environmental Changes, Such Giants Could Thrive Again

If large creatures like elephants, giraffes and bison are allowed to thrive, they could alter habitats that allow for the rise of other giants

Fossilized remains of the giant beaver have been discovered in Minneapolis and Saint Paul, as well as in southern Minnesota.

Bear-Sized Giant Beavers Once Roamed North America, and They’re Now the Official State Fossil of Minnesota

The large, extinct creatures roamed the Twin Cities area more than 10,000 years ago and could grow to more than 200 pounds

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