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Evolution

Birds don’t fly across wide Amazonian rivers like the Rio Negro.

How Amazon Rivers Play a Role in the Evolution of Birds

Rivers are natural boundaries for evolving populations. But scientists don’t agree whether they create new species or just help maintain them.

Anolis scriptus, the Turks and Caicos anole, on Pine Cay

Lizards With Bigger Toes and Smaller Hind Legs Survive Hurricanes

A serendipitous study comparing the physical traits of lizards before and after 2017’s hurricane season shows natural selection in action

Male bat-eared foxes spend much of their time with their offspring, grooming, engaging them in play and teaching them to forage.

This Is Your Brain on Fatherhood

What clownfish stepfathers and Dad-of-the-Year foxes teach us about paternal neurochemistry in the animal kingdom

Behaviors requiring the most pressure were smashing bones for marrow and producing flint flakes

Did the Human Hand Evolve as a Lean Mean Bone-Smashing Machine?

Of nearly 40 things Pleistocene people might have done with their hands, getting to yummy marrow requires the most force and dexterity

Ricardo Martínez digging up the arm of the dinosaur Ingentia prima in Triassic layers of Balde de Leyes, San Juan Province, Argentina.

New Research

The Most Massive of Dinos Evolved Earlier Than Previously Thought

A Triassic giant unearthed in Argentina suggests that dinosaurs took the path to greatness at least twice

Even outside of Hollywood, wasps are fierce contenders in their own right.

Five Real Life Wasp Superpowers Not in Ant-Man and the Wasp

Bees tend to get all the attention, but Marvel turns the spotlight on one of nature’s most devious masterminds

This scrotal male certainly isn't sheepish.

New Research

The Earliest Mammals Kept Their Cool With Descended Testicles

But if free-swinging sperm sacs are the norm, then why did undescended ones evolve four separate times?

Anemonefish, also known as clownfish, are born androgynous and can shift from male to female in one lifetime.

Alternatives to Heterosexual Pairings, Brought to You By Non-Human Animals

No one quite has this sex thing figured out, but these non-binary animals have some good ideas

Contrary to popular beliefs, Neanderthals lived in complex societies and hunted prey cooperatively.

New Research

Neanderthals Hunted in Groups, One More Strike Against the Dumb Brute Myth

The skeletons of deer killed 120,000 years ago offer more evidence of cooperative behavior and risk-taking among our hominin relatives

From glow-in-the-dark squid to the terrifying stoplight loosejaw, creatures of the deep have evolved their own living light time and time again.

Why Bioluminescence Evolved to Be Red Light, and Blue

The laws of nature constrict living light to a few hues, which also happen to be quite patriotic

Researchers studied delicate hyoid bones, which support and ground the tongue, in fossils like these from Northeast China.

Actually, T. Rex Probably Couldn’t Stick Out Its Tongue

The tongues of bird-like dinosaurs and pterosaurs, however, may have been more mobile

Elephants communicate in low rumbles, each listening for the resulting vibrations in the ground with their feet.

New Research

Some Animals Take Turns While Talking, Just Like Humans. Why?

Understanding their courteous exchanges—from frog croaks to elephant rumbles—could shed light on the origins of human conversation

You'd expect to see a raccoon snuffling around at midnight. A sun bear, not so much.

New Research

Fear of Humans Is Forcing Daytime Animals Into Night Mode

The stress is pushing some animals to adjust their schedules—but not all will be quick enough to adapt

Don't judge a bat by its cover ... of Barry White.

New Research

Like Birds, Some Bats Warble to Woo Their Mates

They join an elite club of mammals—including mice, whales and humans—whose melodies convey complex information

An artist's impression of an adult and juvenile Lyrarapax unguispinus — awww, how adorable!

This Prehistoric Sea Creature Had Fanged, Killer Babies

The discovery of a juvenile Lyrarapax unguispinus fossil reveals that even the tiny terrors had a developed claw-like appendage and sharp teeth

New Research

Oldest Footprints Show When Life On Earth Got Legs

Tiny fossil tracks found in South China firmly date appendages back to the Ediacaran period

Megachirella, the mother-of-all-lizards (and snakes).

Cool Finds

Oldest Lizard Fossil Shows These Reptiles Are The Ultimate Survivors

The 250-million-year-old specimen from the Alps suggests that lizards evolved before Earth’s largest mass extinction—and thrived after it

The asteroid didn't just wipe out the dinosaurs—it wiped out the forests. Which meant anything that lived had to learn to live on the ground.

New Research

How the Ancestors of Birds Survived the Dino-Killing Asteroid

Forest cover was crucial to avian evolution, a new study on the mass extinction event asserts

Though the differences between Neanderthals and Homo sapiens may seem pronounced, scientists didn't always embrace the idea that humans evolved from other species.

How Do Scientists Identify New Species? For Neanderthals, It Was All About Timing and Luck

Even the most remarkable fossil find means nothing if scientists aren’t ready to see it for what it is

Charles Darwin was an avid fossil collector and during his expedition on the HMS Beagle, he was one of the first to collect remains of extinct South American mammals.

How Darwin’s Theory of Evolution Evolved

A new Smithsonian Book highlights firsthand accounts, diaries, letters and notebooks from aboard the HMS Beagle

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