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Biology

Every summer, brown bears descend on Brooks River to pack on the pounds needed to survive their winter hibernation. 

Meet the Bodaciously Bulky Bears of Fat Bear Week 2021

The annual tournament celebrates Alaska’s chunkiest brown bears and their summer-long salmon feast

This year's overall winner Laurent Ballesta spent more than 3,000 hours trying to capture his stunning undersea image of mating groupers.

Ten Breathtaking Images From the 2021 Nature Wildlife Photographer of the Year Awards

The annual awards tell the story of our planet’s creatures and the threats they face

Increased immunity from vaccines and previous infections could be a reason behind the drop in cases of "Covid toes." (Pictured: Nurse Sandra Lindsay—the first person to receive vaccine in the USA on December 14, 2020— receives COVID-19 Pfizer vaccine booster in New York on October 6, 2021.)

Powerful Immune System Response May Be Behind ‘Covid Toes’

A new study brings doctors closer to understanding the mysterious frostbite-like lesions on patients’ toes and fingers

The embryo of a small-spotted catshark, safe inside its egg case, is being raised at the aquarium Oceanogràfic València by Associació Lamna, a nonprofit that promotes shark conservation and research. At this stage, the young shark's gills are still external and it is growing from the sustenance provided in the yolk, visible at the bottom of the egg case.

Biologists Rescue Unborn Baby Sharks at Fish Markets

Scientists are collecting egg cases from recently caught pregnant sharks, raising the babies and releasing them into the wild

The Nobel committee announced the winners of the 2021 Nobel Prize in Physiology or Medicine, David Julius and Ardem Patapoutian, earlier today.

Scientists Studied Spicy Chili Peppers and Cool Menthol for Their Nobel Prize–Winning Research on Heat and Touch

Their independent discoveries answer fundamental questions about how we sense our environment and could lead to breakthrough pain relief treatments

Some conservationists have held out hope for species like the ivory-billed woodpecker, which was last spotted in 1944.

Ivory-Billed Woodpecker and 22 Other Species Declared Extinct

Many organisms included in the latest declaration were feared to be lost long before the Endangered Species Act of 1973 was first passed

Denver Bronco player David Bruton grabs his head on the field after a reported concussion. Many patients with such head injuries suffer symptoms months after their diagnosis, even though their brains look healthy on CT scans.

This Molecule Could Be the Key to Understanding Why Concussions Have Such Long-Term Effects

Neuroscientists identified the molecule that persists in the brain—and showed how to disarm it in mice

Scientists analyzed millions of eBird observations to see how bird abundance changed during the early months of the pandemic.

Birds Flocked to Pandemic-Silenced Cities

From ruby-throated hummingbirds to bald eagles, a new study finds our feathered friends thrived in quieter urban habitats

Ultrasound of a 4-month-old fetus

A Brief History of the Sonogram

In the mid-1950s, a Scottish obstetrician became the first to apply ultrasound technology to a pregnant human abdomen

Resurrecting the Sublime recreates the scent of Hibiscadelphus wilderianus, which went extinct in 1912.

What Do These Extinct Plants Smell Like?

A multidisciplinary collaboration resurrects three types of flora lost due to 20th-century colonialism

Heavy metal-fortified mandibles help leafcutter ants save energy and muscle mass.

Heavy Metals Give Ants a Powerful Bite

A combination of metal atoms and natural proteins is the secret behind the super-strong jaws, claws and stingers of some tiny animals

Around 20 percent of female white-necked jacobins have evolved to share the vibrant plumage characteristic of males.

Female Hummingbirds Masquerade as Males to Avoid Harassment

One-fifth of female white-necked jacobins sport flashy male-like plumage, which may help them access more food

The giant tortoise clumsily stalked and ate a lesser noddy tern chick, raising questions about their herbivorous diet.

Giant Tortoise Stuns Scientists by Eating a Baby Bird

In a first, researchers in the Seychelles document the large reptile stalking and devouring a chick

A new study of western diamondback rattlesnakes reveals that they abruptly shift to a high-frequency rattle as danger approaches.

Rattlesnakes Fool Humans Into Thinking They’re Nearby With This Sound-Warping Trick

A new study reveals the snakes change the speed of their rattles to appear closer than they are

A study of two dozen common cuttlefish reveals they can recall specific details regardless of age.

Unlike Humans, Cuttlefish Have Sharp Memories Even in Old Age

The cephalopods remember when, where and what they ate until days before death

Only two of 18 eggs have hatched so far. Congrats to the gator parents, Snowflake and Blizzard!

Rare Albino Alligators Hatch at Florida Zoo

The pair of white and pink hatchlings lack their species’ usual dark coloration

A fox squirrel perched on part of an experiment designed to test its agility and decision-making. Researchers used peanuts to entice the rodents to participate.

New Research

Squirrels Use Parkour Moves and Savvy to Stick Tricky Landings

A new study finds these acrobatic rodents quickly weigh variables like bendy branches to figure out how to safely clear big distances high in the treetops

Olympic runners compete during the 10,000 meters race in Tokyo. In ancient times, running was likely used to push animals to exhaustion during hunting.

Five Ways Humans Evolved to Be Athletes

An archaeologist explores how our prowess in sport has deep roots in evolution

A 3D image of the spiral-shaped intestine of a Pacific spiny dogfish shark. In life, food would move through this intestine left to right.

Innovation for Good

Sharks’ Intestines Spiral Like a Valve Invented by Nikola Tesla

Tesla’s ingenious valve promoted a one-way flow of fluid without the need for moving parts, but, it turns out, evolution got there first

Researchers extracting an ice core from the Guliya Ice Cap in the Tibetan Plateau in 2015.

New Research

Scientists Extract 15,000-Year-Old Viruses From Tibetan Glacier

Researchers say the ancient pathogens are unlikely to cause humans any harm, but 28 out of the 33 viruses found are new to science

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