Mammals

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

Many giant animals roamed the Earth after non-avian dinosaurs went extinct.

After Dinosaurs Went Extinct, These Ten Giant Creatures Roamed the Earth

Though we often think of the “terrible lizards” as behemoths, many later reptiles and mammals also grew to massive sizes

The critically endangered ‘akē‘akē (the Hawaiian name for the band-rumped storm petrel) is one of the species that could benefit from rat-free habitat on Lehua Island, Hawai‘i.

This Tiny Hawaiian Island Is Free of Invasive Rats

Now scientists are trying to coax back lost seabird colonies

The fossil of Icaronycteris gunnelli

Paleontologists Discover 52-Million-Year-Old Bat

The fossil represents the earliest-known species of the flying mammal

After Yellowstone National Park faced an unusually harsh winter, a large number of its nearly 6,000 bison migrated to find food and more temperate climates.

Controversial Yellowstone Hunt Kills More Than 1,100 Bison

The hunt is an effort to control the animal's population and protect cattle outside the park

The meatball made with woolly mammoth DNA was unveiled at a museum in the Netherlands this week.

This Massive Meatball Was Made With Woolly Mammoth DNA

Meant to be more sustainable than animal meat, this lab-grown alternative might offer a glimpse into the future of food production

In a new study, 300 volunteers collected data on almost 700 European hedgehogs across Denmark for research on their lifespan and inbreeding.

World's Oldest European Hedgehog Found by Citizen Scientists

The species faces several threats, but the 16-year-old mammal is “really good news for conservation”

Personnel bury pelicans that may have died from avian flu in Lima, Peru, on December 7, 2022. At least 585 seals and 55,000 birds have been found dead in Peru, likely due to avian flu.

As Bird Flu Spreads to Mammals, Health Officials Urge Caution

Transmission between minks has called attention to the potential risks to humans, though experts say not to panic

A bear in Colorado took a liking to a wildlife camera, capturing hundreds of selfies.

This Black Bear Took Hundreds of ‘Selfies’ on a Wildlife Camera

Of the 580 images captured by the camera in November, about 400 were of the bear

Derek Burgoyne captured the moment a moose sheds its antlers using a drone in New Brunswick, Canada.

Watch Rare Drone Video of a Moose Shedding Its Antlers

A wildlife enthusiast in eastern Canada stumbled across the magnificent event this month

The Columbia Basin pygmy rabbit relies on sagebrush for food and shelter, but the shrub has nearly disappeared. It's also slow to regrow: it takes about two decades, or ten pygmy rabbit lifetimes.

Can Scientists Save the World’s Tiniest Rabbit?

In Washington State, the race is on to save a diminutive bunny as wildfires threaten its already shrinking habitat

The small mammal's foot in the fossil of the microraptor.

This 120-Million-Year-Old Dinosaur Fossil Had a Mammal Hiding in Its Stomach

The finding represents only the second recorded instance of a dinosaur consuming a mammal

This 2013 photo of P-22 helped catapult him to fame. The cougar inspired conservation projects for urban wildlife and earned a robust Instagram following.

Why Los Angeles Fell in Love With the Mountain Lion Known as P-22

A local celebrity, the feline that was the face of several conservation campaigns died this weekend

A beaver relaxes in water in Anchorage, Alaska. `

As the Arctic Warms, Beavers Move In

Scientists are beginning to study the impacts of beaver dams on the tundra

Humans have come up with a number of wacky methods to keep animals deemed "vermin" in check.

Seven of the Wildest and Weirdest Attempts to Curb Animal Pests

Why use fences or traps, when you can use deadly viruses or lustful snakes?

A mouse lemur grasps onto a tree branch in Madagascar. Scientists looked to characteristics in such modern primates to form a hypothesis about how primates behaved after an asteroid wiped out non-avian dinosaurs.

Soon After Dinosaur Decimation, Our Primate Ancestors Began Pouncing on Prey

Nails helped them climb trees quietly, and forward-facing eyes helped with depth perception to aid in precise leaping

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