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You Get Thirsty and Drink. How Does Your Brain Signal You’ve Had Enough?

When Stars Were Born: Earliest Starlight’s Effects Are Detected

No Sign of Newborn North Atlantic Whales This Breeding Season

Barbra Streisand Cloned Her Dogs. For $50,000, You Can Clone Yours.

Robot Claw Shows Intricacies of Crab Courtship

For Fiddler Crabs, ‘Size Does Matter’

Inside Wounded Flies, Fat Cells Race to the Rescue

King Penguins Are Endangered by Warmer Seas

Scientists Fear for Colombia’s ‘Melted Rainbow’

It’s a Dog’s World, Especially in the Lab. Where Are the Cats?

F.D.A. to Expand Medication-Assisted Therapy for Opioid Addicts

The Ocean Breathes So We Can, Too

A 3-D Look Inside the Tasmanian Tiger’s Pouch, Long After Extinction

The Chambered Nautilus Is the Ocean’s Most Efficient Jet Engine

The World’s First Misunderstood Artists: Neanderthals

For Vampire Bats to Live on Blood, It Takes Guts

He Took a Picture of a Supernova While Setting Up His New Camera

A Case for Wild Flamingos Calling Florida Their Home

In Picasso’s Blue Period, Scanners Find Secrets He Painted Over

Astronomers’ Dark Energy Hopes Fade to Gray

Animals Are Losing Their Vagility, or Ability to Roam Freely

Coffee Beans Are Good for Birds, Fancy Brew or Not

It’s Harder to Make Meals in the Mountains

Nearly 150,000 Orangutans Vanished Over 16 Years

The Cuttlefish, a Master of Camouflage, Reveals a New Trick

Ancient Artists Carved Camels in Saudi Desert’s Stone

Peru Moves to Protect ‘One of the Last Great Intact Forests’

Debunked: The Strange Tale of Pope Gregory and the Rabbits

How Cockroaches Crash Into Walls and Keep Going

Some Songbirds Have Brains Specially Designed to Find Mates for Life

Feline Foodies

NASA Budgets for a Trip to the Moon, but Not While Trump Is President

At Site of Japanese Volcano’s Supereruption, an Immense Lava Dome Lurks

These Skates Are Made for Walking

Archaeologists in Egypt Discover 4,400-Year-Old Tomb

Starfish See Pretty Well in the Deep Ocean. By the Way, Starfish Have Eyes.

Toads Eat Beetles. Sometimes, Beetles Make Them Regret Their Meal Choice.

Secrets of a Snake's Belly Crawl

Watch the SpaceX Falcon Heavy Rocket Launch Today

How the Snake Pours Its Way Across the Ground

This Mutant Crayfish Clones Itself, and It’s Taking Over Europe

In Australia, Arsonists May Have Wings

Many Animals Can Count, Some Better Than You

Newly Discovered Form of Water Ice Is ‘Really Strange’

Ancient Spider-like Creature With Tail Found Trapped in Amber

Unlocking Secrets of Sour Flavors With Something Found in Your Ears

Sedate a Plant, and It Seems to Lose Consciousness. Is It Conscious?

The Octopus: Stable Genius

The Smiling Axolotl Hides a Secret: A Giant Genome