Mammals

A sea lion receiving care at the Pacific Marine Mammal Center in Laguna Beach, California, shows signs of domoic acid poisoning.

Algae Is Making Sea Lions More Aggressive in California

A toxin present in algal blooms is moving through the food chain, leading to the deaths of sea lions and dolphins

Dolphins and humans both change how they communicate when they're around babies.

Dolphins Use Baby Talk When Their Calves Are Around

Like humans, female dolphins make higher-pitched vocalizations when communicating with their young

A variety of saber-toothed animals have evolved to fill different niches.

Eight Menacing Saber-Toothed Creatures That Stalked the Earth Long Ago

From before the dinosaurs to the Ice Age, several mammals and their forerunners sported the iconic, curved teeth

Nihohae matakoi swam in waters off the coast of New Zealand around 25 million years ago.

These Prehistoric Dolphins Had Tusk-Like Teeth

The animals likely thrashed their heads back and forth to injure or stun prey with their unusual, horizontal teeth

Because moose are largely solitary, it's unlikely a rabies outbreak will occur in Alaska's population, according to officials.

First Rabid Moose Recorded in Alaska Was Stumbling Through a Town

The large mammal likely contracted the virus from a fox, say wildlife officials

A SeaWorld team prepares to release a rescued manatee.

The Race to Save Florida’s Manatees

Researchers are nurturing sick and injured animals back to health while working to protect natural springs and curb seagrass decline

The mastodon tooth was discovered on Rio Del Mar State Beach in California.

Woman Finds Mastodon Tooth on California Beach

The photos she shared set off a search for the fossil, which she had left behind. Now, scientists have the tooth, just the third of its kind found locally

The wolverine sighting in Yosemite National Park

Rare Wolverine Spotted in California—the Second in 101 Years

The elusive creatures disappeared from the Golden State in 1922

After eight months of hibernation, Arctic ground squirrels emerge in the spring hungry and ready to mate.

Climate Change Is a Wake-Up Call for Hibernating Squirrels

As spring arrives sooner, female Arctic ground squirrels are emerging from their burrows earlier, according to a new study

Raffie the echidna, roaming through Australian rocks.

See the Rare Albino Echidna Spotted in Australia

Dubbed Raffie, the egg-laying mammal is an unusual color and "beautiful"

Representative Robert F. Broussard believed hippos imported from Africa would rid Louisiana and Florida of the water hyacinths smothering their waterways.

How the U.S. Almost Became a Nation of Hippo Ranchers

In 1910, a failed House bill sought to increase the availability of low-cost meat by importing hippopotamuses that would be killed to make "lake cow bacon"

An illustration of the giant gorgonopsian Inostrancevia scaring off the much smaller African species Cyonosaurus

During the 'Great Dying,' This Saber-Toothed Predator Reigned

This ancestor of mammals briefly thrived amid a massive extinction event, hinting at how carnivores may respond to climate change today

A distinct subpopulation of orcas lives in the Strait of Gibraltar off the coast of Spain, where they hunt and eat Atlantic bluefin tuna.

Orcas Are Ramming Into Ships Off Europe's Coast

One researcher says this may be a response to a "critical moment of agony" a female orca experienced with a boat

Did lions once live in ancient Greece?

Did Lions Live in Ancient Greece? And More Questions From Our Readers

You’ve got questions. We’ve got experts

Platypuses are egg-laying mammals with webbed feet and duck-like bills.

Platypuses Return to Australia's Oldest National Park

The egg-laying mammals haven't been seen at the site since the 1970s, but scientists hope the newly released creatures can re-establish a population

Mammoth and elephant tusks are elongated incisors, so they're made of the same materials as other teeth.

Male Woolly Mammoths Had Testosterone-Fueled Aggressive Episodes

By studying preserved tusks, scientists suggest the mammals experienced a yearly condition known as musth, like male elephants do today

Using suction-cup sensors attached to three humpback whales, researchers captured video footage of the animals rolling around on the ocean floor.

Watch Whales Exfoliate Their Skin on the Ocean Floor

Migrating humpbacks used sand and rubble to slough off dead skin and barnacles, a behavior that may be both practical and social

Male California sea lions are polygamous and must fight to defend their territories and their harems.

Why Male California Sea Lions Are Getting Bigger

The “raccoons of the sea” have varied diets, allowing them to grow large to compete for mates

Balto and his sled driver, Gunnar Kasson, at the unveiling of Central Park's Balto statue in 1925.

Balto's DNA Provides a New Look at the Intrepid Sled Dog

Scientists sequenced the famous canine's genome as part of a larger project studying the genes of 240 mammal species

Sleeping northern elephant seals on the beach at Año Nuevo State Park, California.

Elephant Seals Take Extreme Power Naps in the Open Ocean

While foraging on deep dives, the marine mammals sleep for about two hours per day in short, ten-minute bursts

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