Sea Creatures

Diadema antillarum sea urchins in the Caribbean Sea

Scientists Solve a Sea Urchin Murder Mystery

A microscopic parasite that has been killing the Caribbean creatures since last year might also be at fault for a population collapse four decades ago

Male California sea lions are polygamous and must fight to defend their territories and their harems.

Why Male California Sea Lions Are Getting Bigger

The “raccoons of the sea” have varied diets, allowing them to grow large to compete for mates

Huge quantities of plastics make their way into oceans and other bodies of water.

The Pacific Garbage Patch Is Home to Coastal Species—in the Middle of the Ocean

These out-of-place organisms are thriving on floating trash, but they may compete with open-water species

A group of snailfish swims between 7,500 and 8,200 meters below sea level. The deepest fish was filmed at 8,336 meters under the surface.

Behold the Deepest Fish Ever Filmed

A juvenile snailfish was caught on video more than five miles below sea level in waters south of Japan

A monk seal in southern Greece. Females tended to give birth on beaches before human hostility drove them into hiding.

The Mediterranean Monk Seal Is Making a Comeback

The endangered sea creature, known for its reclusive nature, has re-emerged out of the shadows

Between 2013 and 2017, 90 percent of the sunflower sea star population was wiped out from a disease called Sea Star Wasting Syndrome.

These Sea Stars Are Literally Wasting Away—but They May Soon Receive Protection

Sunflower sea stars have been recommended for Endangered Species Act protection as disease leads them to “disintegrate into gooey masses”

Industrialization changed Italy’s Bagnoli Bay. Analyzing the DNA that was trapped in sediment offers a record of what was lost—and a clue as to how to get it back.

DNA Buried in Sediment Helps Scientists Picture Past Ecosystems

Examining the evidence offers a way to look back at now damaged environments

Conference president Rena Lee of Singapore announces an agreement was reached on Saturday.

Historic Treaty Protects Marine Life in the 'High Seas'

The United Nations agreement will help conserve 30 percent of the planet’s oceans by 2030

Thor rests in Scarborough Harbor in England on December 31, 2022.

The Unusual European Journey of Thor the Walrus

It's rare to see one of these massive marine mammals in Western Europe, but Thor spent several months delighting crowds in multiple countries

A digital reconstruction of a humpback whale trap feeding, a behavior with striking similarities to the feeding habits of the "hafgufa" described in medieval Norse texts.

These Mythical Sea Monsters May Have Been Whales With Unusual Dining Habits

Tales of creatures like the Norse “hafgufa” suggest ancient and medieval people may have seen whales trap feeding

Wolves on Pleasant Island are actively hunting and eating sea otters.

In Alaska, Hungry Wolves Have Started Eating Sea Otters

After devouring their island's deer, these canines may be the first land predators to rely on sea otters as a main food source

Copepods at various life stages teem inside a water droplet. The creatures go through six larval and six juvenile stages between egg and adulthood. They grow a new pair of legs at each stage.

These Gorgeous Photos Capture Life Inside a Drop of Seawater

A passion for the infinitesimal leads a photographer to discover the countless creatures that live unseen in the ocean

A drawing of the extinct Steller's sea cow

An Extinct Sea Cow May Help the Restoration of California’s Dwindling Kelp Forests

Researchers are modeling out what the ocean may have looked like when the seaweed-munching mammal roamed the shores

An illustrated reconstruction of Leviathanochelys aenigmatica.

Scientists Unearth a Prehistoric Marine Turtle the Size of a Car

Fragments of the creature's pelvis and shell were discovered in the Pyrenees

A tiger shark swims above seagrass.

Tiger Sharks Carry Cameras to Help Scientists Map Seagrass

A new study found what might be the world's largest seagrass ecosystem: a 35,500-square-mile meadow in the Bahamas

Polar bears are back in Churchill, Manitoba.

Polar Bears Are Gathering in Canada—and You Can Watch Them Live

Bears return to Churchill, Manitoba, every autumn to await the formation of sea ice on the Hudson Bay

Immortal jellyfish (Turritopsis dohrnii) are smaller than the nail on your pinky finger.

‘Immortal Jellyfish’ Could Spur Discoveries About Human Aging

After reaching maturity, these deep-sea creatures can revert to a juvenile stage and repeat their life cycle

Dugongs have disappeared from waters off of China.

Dugongs Are ‘Functionally Extinct’ in China, Research Suggests

Scientists found no verified sightings of the massive marine mammals in the region since 2000

A species of Chelonaplysilla sea sponge ejects mucus.

Sea Sponges Sneeze Sediment-filled Snot

New research reveals the animals expel mucus as a form of self-cleaning and other creatures eat the stuff up

A new species of giant isopod, Bathynomus yucatanensis

New Species of Deep Sea Isopod Discovered

The giant crustacean was originally mistaken for a different species at an aquarium in Japan

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