Wildlife

Five-day-old red-eyed treefrog embryos are tightly curled inside dehydrated eggs packed closely together. It’s dry enough to make them begin to hatch early amid heating.

Panama

When the Heat is On, Red-Eyed Treefrogs Hatch Early

The embryos make the move from clutches on leaves to rainforest ponds below

An artist’s reconstruction of Qianodus duplicis, the earliest known fish that had a mouth with teeth

Haul of Fossil Fish Pushes Back the Origin of Teeth and Jaws

The unexpected finds illustrate life during a critical and little-understood time period

A European eel swims in the Baltic Sea. 

The Utterly Engrossing Search for the Origin of Eels

To save the endangered animals, researchers have been working for decades to figure out where they reproduce

A bull walks in front of a cow. If they mate, the bull’s sperm will likely cluster together as they swim through the female’s reproductive organs.

Bull Sperm Get by With a Little Help From Their Friends

Traveling together helps the sperm navigate a tricky, sticky migration through a cow's reproductive tract

One reader wonders: Why did ants make it all over the Americas while anteaters didn’t?  

Why Do Anteaters Live Only in the Tropics and More Questions From Our Readers

You've got questions. We've got experts.

After the manta ray filters out the tiny plankton from the water it ingests, the excess water exits through the dark gill slits on the ray's ventral side. 

Planet Positive

Why Conservationists Are Hopeful About the Manta Ray's Future

The giant fish faces threats from poachers, boat strikes and climate change

About two to three million birds of prey fly through Panama each fall, in what amounts to the world’s third-largest raptor migration.

Panama

Watch Millions of Raptors Fly Across Panama This Fall

The country’s unique shape makes it a perfect migratory pathway for the birds of prey

Along the Vietnamese coast, temples constructed in reverence to whales and other marine mammals—such as this one in Phan Thiet—house valuable information on the country’s little-studied cetaceans.

Inside Vietnam's Whale Temples

Centuries-old whale worship shrines are shedding light on the diversity and distribution of marine mammals off the country's coast

A Haast's eagle hunts moa.

How a Giant Eagle Once Came to Dominate New Zealand

Before the formidable bird went extinct, scientists say it likely hunted the flightless moa

Migrating waterbirds over South Dakota’s Huron Wetland Management District on North America’s Central Flyway.

Scientists Are Using These High-Tech Tools to Study Bird Migration

Tracking the journeys of different species is key to protecting them from habitat loss and other threats

Lions in South Africa’s Greater Kruger National Park are feared by many different prey animals, which will run away as soon as they hear a lion growl.

How Animals Survive in a Savanna Full of Predators

Ecologists have documented a hierarchy of fear in the South African grassland, and the king of beasts is at the top

A male bison atop an arid hillside on Santa Catalina Island in California.

The Uneasy Future of Catalina Island's Wild Bison

One of Hollywood’s weirdest legacies, the herd of beasts lives under the watchful eye of local conservationists

Birds that wander out of their home ranges can be an unexpected source of revenue. Stella, a Steller’s sea eagle, recently turned up in Maine and Massachusetts, drawing tourists who spent nearly US $500,000.

Birds Wandering Far From Home Can Be a Boon for Local Tourism

When an internet-famous Steller’s sea eagle turned up roughly 11,000 kilometers off course in late 2021, birders flocked to catch a glimpse

Hoffmann’s two-toed sloth babies need round-theclock care. Once they’re adults, they’ll be microchipped and released back into the rainforest.

Baby Sloths Are About as Cute As You Would Expect

A Costa Rica rescue center offers blankets and bottle-feeding at a nursery for these young animals

Scientists scanned a fossil of the Jurassic cephalopod Vampyronassa, pictured here, and found clues that it was an active hunter.

What New Tech Is Revealing About Squishy, Prehistoric Cephalopods

Researchers have adopted innovative means, from cutting-edge scans to swimming robots, to reveal more about how the creatures lived

Donkeys often trample plants in the deserts of the southwestern United States, including in Death Valley National Park in California.

Cougars Are Killing Feral Donkeys, and That’s Good for Wetlands

Mountain lions play an important role in the Death Valley ecosystem by preying on the introduced species

In the Mediterranean Sea, ship strikes are the leading cause of death for sperm whales.

A New Detection System Could Save Sperm Whales From Ship Strikes

Scientists have developed a computational technique that can track whales in real time—and potentially prevent collisions

Spotless starling chicks use a bright yellow oil to enhance the color of their mouth, which scientists verified by rubbing a cotton swab over the area.

The Done-Up Bird Gets the Worm

Starling chicks apply their preening oil as a lipstick to get more food from their parents

A sulphur-crested cockatoo bows down at the Madrid Zoo Aquarium. The birds have been seen dancing to music and opening trash bins to get to food.

What Can Dancing Cockatoos Teach Us About Ourselves?

An evolutionary biologist demystifies bird intelligence in an excerpt from her new book

ElSa is a prototype of a machine-learning-driven software that analyzes movement patterns in videos of humans and elephants.

Good News

This Teenager Invented a Low-Cost Tool to Spot Elephant Poachers in Real Time

Seventeen-year-old Anika Puri created a machine-learning-driven model that analyzes the movement patterns of humans and elephants

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