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Mammals

A young male bongo photographed in Maasai Mau, Kenya

Trail Camera Photos Capture Rare Antelopes in a Kenya Forest Where Conservationists Once Feared They Had Vanished

Fewer than 100 mountain bongos are thought to live in the wild, and the new discovery reveals a crucial habitat for the critically endangered creatures

A swan swims on the Scharmützelsee at sunrise on July 2, 2025, when temperatures in the nearby German cities of Berlin and Brandenberg were expected to hit 102 degrees Fahrenheit.

‘Stupid Hot’: Heat Waves Muddle the Minds of Animals and Humans as Confusion and Aggression Seem to Rise With the Temperature

Wide-ranging research suggests that as temperatures increase, some creatures pick fights while others struggle to learn. The findings hint at consequences that may ripple through ecosystems

Two giraffes cross in elegant symmetry beneath a radiant sunset.

You’re Guaranteed to Spot at Least One Gorgeous Giraffe in Each of These 15 Stunning and Awe-Inspiring Images

With their singular coats, naturally craning collars and elegant gait, these skyscraping mammals can’t help but attract sightseers to their neck of the woods

An illustration of an Alston’s singing mouse from the 1882 publication Biologia Centrali-Americana: Mammalia

These Singing Mice Squeak Back and Forth—and Don’t Interrupt. Scientists Found the Brain Pathway Behind Their Impressive Songs

Alston’s singing mice carry out complex vocalizations and even appear to converse politely with one another. The neural circuitry that makes this possible is simpler than researchers expected

Two Alpine ibexes butt heads, slamming their horns together in a powerful battle that can be heard from far away. They wandered up the slope together afterward.

See 15 Stunning Images That Won the German Society for Nature Photography’s Annual Contest

From a lunging frog to the majestic movements of penguins, the honored photographs capture the wonder of wildlife and beauty of natural landscapes

About 47 percent of wolves in Italy are considered wolf-dog hybrids, according to a recent genetic analysis.

Nearly Half of Italy’s Wolves Are Part Dog Now, Thanks to Hybridization. Is That a Threat to the Species?

Wolf-dog hybrids are growing far more common in Italy, raising scientists’ concerns for the future of the wolves

A female lynx named Ulcera carries a rabbit to a water trough and dunks it on July 16, 2024. This incident was one of eight that researchers recorded among lynxes in central Spain.

Camera Traps Reveal Iberian Lynxes Soaking Their Prey, a First-Ever Discovery Among Carnivores

Scientists speculate that the wild cats are trying to improve hydration or ease their cubs’ transition to solid food. The finding points to resilience in one of the world’s most endangered felines

Scientists have long assumed that queen transitions in naked mole rat colonies were always chaotic and violent. But new research suggests another, more peaceful path also exists.

Naked Mole Rats Usually Duke It Out to Choose Their Next Queen. But These Unusual Rodents May Be Capable of More Peaceful Transitions of Power

In a laboratory experiment centered around a colony known as the Amigos, researchers observed a subordinate female take over reproduction without incident

Elephant calf Linh Mai stomps in a shallow pool in the Elephant Community Center at the Smithsonian’s National Zoo and Conservation Biology Institute on February 25.

See the Most Adorable Photos of Baby Elephant Linh Mai, the National Zoo’s Newest Star

Since her birth in early February, the calf has been growing and beginning to bond with her care team and herd. She will go on view in-person and online starting April 22

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There's More to That

Hear From a Wildlife Photographer’s Dramatic Glimpse Into the Dwindling World of the Cascade Red Fox

Gretchen Kay Stuart has chronicled the work of a small team of biologists who are trying to keep a little known and breathtakingly beautiful endangered species from disappearing

The sperm whales gathered around the mother before the delivery. 

Watch Unprecedented Footage of Sperm Whales Helping a Newborn Calf Take Its First Breaths

Unrelated animals worked with the mother and her relatives, marking the first known evidence of whales from multiple families assisting in a birth

Researchers recently discovered that platypuses are the only known mammals with hollow melanosomes, a pigment-filled structure that gives hair, fur, skin, feathers and eyes their color. 

Platypus Hair Shares a Puzzling Feature With Bird Feathers, Adding to the Egg-Laying Mammal’s List of Unusual Characteristics

The species’ melanosomes—tiny, pigment-filled structures inside hair cells—are hollow, a trait never before seen in mammals

Participants listened to pairs of mating calls made by numerous creatures, including male green treefrogs.

Humans and Animals Often Like the Same Mating Calls, Supporting a 150-Year-Old Observation by Charles Darwin

New research by Smithsonian scientists suggests that preferences for certain sounds might be evolutionarily conserved

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See the 2,500-Pound Bronze Bison as They Arrive at Their New, Permanent Place at the Smithsonian’s National Museum of Natural History

More than a century ago, the massive mammals actually grazed beside the Smithsonian Castle. As of today, two large sculptures continue that legacy as they flank the museum’s main entrance

Some researchers think that two varieties of orcas are so different that they should be considered separate species. 

Do These Severed Orca Fins Covered in Tooth Marks Mean Killer Whales Are Cannibals? It’s Complicated, Scientists Say

Researchers suggest that predation by a subspecies called Bigg’s orcas might explain why members of another one, called resident orcas, stay in such large family groups

The pygmy long-fingered possum uses its specialized ears and long digits to hunt for grubs in rotting wood.

Scientists Thought These Marsupials Went Extinct 6,000 Years Ago. They Just Found the Animals Alive

The pygmy long-fingered possum and the ring-tailed glider are rare examples of “Lazarus species”

Jaguars in Porto Jofre, Brazil, support a lucrative tourism industry, leading conservationists to argue that the big cats are most valuable when they’re alive.

In the World’s Best Place to See Wild Jaguars, Residents Are Using the Big Cat’s Appeal to Reach Conservation Goals

Brazil’s Pantanal region has the highest jaguar density on Earth, drawing camera-toting visitors to its riverbanks. Despite overtourism concerns, one enclave may offer a model for how to protect the charismatic apex predator

Scientists at the Woods Hole Oceanographic Institution quickly identified the recording as belong to a humpback whale. 

Listen to What Archivists Believe to Be Oldest-Known Whale Recording

The nearly 80-year-old disc resided in the archives of the the Woods Hole Oceanographic Institution for decades and may hold the secret to learning about changes in whale behavior over time

Based on Andrewsarchus’ skull size and the skull-to-body-size ratios of other hoofed predators called mesonychids, scientists estimated in 1924 that the beast was more than 12 feet long and about 6 feet tall. Reassessments of Andrewsarchus’ evolutionary tree, however, suggest this estimate is inaccurate.

This Giant Carnivore Ran on Hooves. Scientists Are Investigating Its Massive Skull and Crushing Teeth to Decipher the Beast’s True Nature

For more than a century, paleontologists have been piecing together how the mysterious predator Andrewsarchus is related to other mammals, like the extinct “hell pigs” and “wolves with hooves”

An elephant has about 1,000 whiskers on its trunk.

An Elephant’s Trunk Is Covered in Whiskers—and They’re Unlike Those on Any Other Animal, a New Study Suggests

Hundreds of the specialized hairs help the poor-sighted creatures navigate the world

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