Biology

Box jellyfish are about the size of a grape.

Brainless Jellyfish Are Capable of Learning, Study Suggests

Scientists provide evidence that tiny Caribbean box jellyfish—which lack a central nervous system—can learn to navigate through mangrove roots

Sea lions breed and give birth at Point La Jolla in San Diego.

San Diego Closes Popular Beach for Seven Years to Protect Sea Lions

Visitors have been getting too close to the marine mammals—taking selfies and even harassing them—as they rear their pups

Why can't we stop anthropomorphizing our animal friends and foes?

Are Wild Animals Really Just Like Us?

A summer of news reports about orca, otter and bird “attacks” has the public wondering if trying to understand animal behavior in human terms is misguided

Two types of white blood cells, a neutrophil (top) and a lymphocyte (bottom), in human blood.

Human Cells Display a Mathematical Pattern That Repeats in Nature and Language

New research suggests adult humans have between 28 trillion and 36 trillion cells, which follow a commonly seen distribution of size and mass

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 female whale was found stranded in January on a beach near Palm Coast, Florida.

How an Orca Skeleton Made Its Way From Florida to the Smithsonian

Washed up in a rare stranding event, the newly collected specimen will offer rich exploration for researchers

Scientists inserted human stem cells in pig embryos that couldn't develop kidneys, then let these embryos gestate in sows for several weeks. The experiments resulted in kidneys partly made of human-derived cells.

Scientists Grow Part-Human Kidneys in Pig Embryos for Nearly a Month

The new work is a "big step forward" in finding new ways to generate viable organs for human transplants, but it comes with some ethical considerations

Scientists came across the golden orb while exploring the seafloor of the Gulf of Alaska with a remotely operated vehicle on August 30.

What Is This Mysterious Golden Orb Scientists Found on the Ocean Floor?

After bringing the four-inch-diameter blob to the surface, researchers still only know that it is “biological in origin”

The clouded leopard kitten, born last month at the Oklahoma City Zoo, has now been transferred to the Nashville Zoo to be hand-reared and eventually paired with a mate.

'Rare' Clouded Leopard Kitten Born at the Oklahoma City Zoo

Keepers hope the young male will have his own "little cloudies" one day, helping maintain the vulnerable species' captive population

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

Scientists know very little about the social behaviors of great white sharks, but they're trying to learn more.

How Two Great White Shark 'Buddies' Could Change Perceptions of the Species

A pair of great white sharks named Simon and Jekyll have been swimming together for more than 4,000 miles in recent months

Scientists are investigating how blood cells or other parts of blood might be responsible for aging.

Old Mice Could Live Longer by Sharing Young Blood, Study Finds

After surgically attaching pairs of mice, scientists suggest the procedure could rejuvenate the older individuals, slowing their aging

The snake's new enclosure is specially designed to help the creature avoid hurting itself.

A Rare Two-Headed Snake Is Back on Exhibit at a Texas Zoo

Pancho and Lefty, as the western rat snake is known, has now healed from an injury it suffered more than two years ago

An artist's interpretation of what Perucetus colossus would have looked like when it lived some 38 million years ago

This Massive Extinct Whale May Be the Heaviest Animal That Ever Lived

The newly discovered behemoth could unseat the blue whale for the title, but scientists can only make educated guesses about its weight

Fork-tailed drongos have a signature color and pattern on their eggs, which helps them avoid getting duped by African cuckoos.

How These Birds Can Spot Look-Alike 'Imposter' Eggs in Their Nests

Fork-tailed drongos can identify and reject egg forgeries, laid by African cuckoos, with nearly 94 percent accuracy, new research suggests

The so-called puss caterpillars have sharp spines that can inject powerful venom into humans.

Scientists Reveal Why Asp Caterpillar Stings Are So Excruciatingly Painful

A toxin in the insect's venom, which can punch a hole in cell walls, could inspire new drug-delivery methods in humans

Honeybees, which are not native to the United States, may be outcompeting native bees for pollen.

Pollination From Honeybees Could Make Plants Less Fit to Survive and Reproduce

Plants visited by honeybees rather than native bees may become more inbred, a new study suggests

A researcher holding human embryonic stem cell cultures in 2004. In the new research, scientists use human stem cells to make models similar to human embryos. The models cannot develop into fetuses.

Researchers Create Model Human Embryos Using Stem Cells

The teams hope to learn more about the first few weeks of human development and provide insights into treatments for infertility and diseases

Tighter curls may dissipate more heat than other types of hair or no hair.

Curly Hair Keeps the Head Coolest

A new study suggests our locks may have evolved to prevent our brain from overheating

After eight months of hibernation, Arctic ground squirrels emerge in the spring hungry and ready to mate.

Climate Change Is a Wake-Up Call for Hibernating Squirrels

As spring arrives sooner, female Arctic ground squirrels are emerging from their burrows earlier, according to a new study

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