Evolution

For species that reproduce sexually, every offspring is a gamble. Each has slightly different genes, giving it the potential to be carrying helpful, adaptive traits.

Can Animals Evolve Fast Enough to Keep Up With Climate Change?

Some may be able to, while others may not

Dogs are one of the few animals that use their tails primarily for communication.

Why Do Dogs Wag Their Tails? Scientists Examine the Endearing Behavior

Dogs communicate through tail-wagging, and humans may have selected for the trait during domestication

The 160-year-old pelt of the woolly dog Mutton in the Smithsonian’s collection

What Happened to the Extinct Woolly Dog?

Researchers studying the 160-year-old fur of a dog named Mutton in the Smithsonian collections found that the Indigenous breed existed for at least 5,000 years before European colonizers eradicated it

An artist's impression of Gigantopithecus blacki near a forest in southern China.

What Caused the Mysterious Extinction of 'Giganto,' the World's Largest Ape?

The massive primates were unable to shift their diet to keep pace with a changing climate, according to a new study, forcing them to eat less nutritious bark and twigs

Cyanobacteria, or blue-green algae, on the surface of a lake. Bacteria were the first organisms to photosynthesize, creating the oxygen essential for the evolution of life on Earth.

Scientists Uncover the Earliest Fossil Evidence of Photosynthesis

Ancient cyanobacteria contained structures for producing oxygen around 1.75 billion years ago, according to a new study

An artist's depiction of a person carving a pendant from bones of a giant sloth roughly 25,000 to 27,000 years ago. Research this year suggested humans and the sloths lived in Brazil at the same time, strengthening evidence that our ancestors populated the Americas earlier than thought.

Thirteen Discoveries Made About Human Evolution in 2023

Smithsonian paleoanthropologists reveal some of the year’s most fascinating findings about human origins

Electric eels can discharge up to 860 volts of electricity.

Eels Can Genetically Modify Nearby Fish With Their Electrical Pulses

In laboratory experiments, gene transfer occurred in 5 percent of zebrafish larvae that were near eels when they discharged electricity

Female mosquitoes need to drink blood in order to produce their eggs.

Male Mosquitoes May Have Once Sucked Blood, Amber Fossils Suggest

Today, only female mosquitoes feed on the blood of animals, while males are satisfied with plant juices

Neanderthals have held our fascination ever since we first identified their remains.

Here's What We Know About Neanderthals So Far

Today, thanks to new artifacts and technologies, findings about our closest relatives are coming thick and fast

Fossilized Trisauropodiscus tracks from more than 210 million years ago (marked with 4 cm scale) compared to modern bird tracks from March 2018 (marked with 3 cm scale)

Mysterious Creatures With Bird-Like Feet Made These Tracks Long Before Birds Evolved

The footprints pre-date the earliest known fossils of avian ancestors by roughly 60 million years, per a new study

A group of chimpanzees at elevation listen for rivals.

While Some Chimps Go Low, Others Go High to Avoid a Dangerous Fight

Primate groups climb to elevation to scout out rivals and steer clear of clashes

Female chimps at the Taronga Zoo in Sydney, Australia, in 2005. The new study followed 185 chimps in Uganda's Kibale National Park for 21 years.

Wild Female Chimpanzees Go Through Menopause, Study Finds

Until now, menopause had not been documented in wild, non-human animals, except for a few species of toothed whales

Can every living thing be traced to a single cell?

Can Every Living Thing Be Traced to a Single Cell? And More Questions From Our Readers

You’ve got questions. We’ve got experts

An illustration of the Homo erectus child with her mother in the Ethiopian highlands, two million years ago

Two Million Years Ago, This Homo Erectus Lived the High Life

Dating of a child's fossilized jaw and teeth suggest our relatives lived at altitude earlier than once thought

Mammal taxidermy under ultraviolet light: (a) polar bear, (b) southern marsupial mole, (c) greater bilby, (d) mountain zebra, (e) bare-nosed wombat, (f) six-banded armadillo, (g) orange leaf-nosed bat, (h) quenda, (i) leopard, (j) Asian palm civet.

More Mammals Can Glow in the Dark Than Previously Thought

A new study found that 125 different mammal species are fluorescent under ultraviolet light, suggesting the property is widespread

Artistic reconstruction of a group of hominins in direct competition for carrion with a hyena

One Million Years Ago, Our Human Relatives May Have Challenged Giant Hyenas for Carcasses

Groups of hominins might have successfully scavenged large kills, new modeling finds

Some birds—including blue jays—are strong vocal learners that can mimic other birds and make lots of different sounds.

Songbirds That Learn to Make New Sounds Are the Best Problem-Solvers

Birds—and humans—are vocal learners, meaning they can imitate new vocalizations and use them to communicate

The Gans' egg-eater swallows a quail egg far larger than its head.

How a Small Snake Can Eat Meals Many Times Larger Than Its Head

The egg-eating African reptile uses its stretchy jaw skin to swallow huge prey, a feat that not even a python can match

An X-ray microcomputed tomography scan of a male Eucera bee mummified inside a cocoon.

Paleontologists Discover Mummified Bees Preserved in Their Cocoons for 3,000 Years

Some kind of "catastrophic" event, such as a sudden freeze or flood, likely killed all the young adult bees at once, according to a new study

Hogfish can change their color in less than a second to blend in with their surroundings.

How Color-Changing Hogfish Use Their Skin to 'See' Themselves

Light-sensitive proteins in the fish's skin could play a role in monitoring how they camouflage, researchers theorize in a new study

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