Sea Creatures

Imagine dragons—or go for a dive in the Pacific Ocean and keep an eye out for this astonishing two-inch sea slug known as Goniobranchus sp. 1.

Dive Into the Exotic World of Nudibranchs, the Spectacular Slugs of the Sea

Psychedelic hedgehogs, purple pineapples, living strawberries—these tiny creatures show off their big personalities off the Australian coast

An elephant seal pup on South Georgia Island

Why Did Seals and Sea Lions Never Commit to a Life Fully at Sea?

While whales moved from living on land to an existence immersed in water, pinnipeds embraced an amphibious lifestyle

Curator Frances McIntosh says the collection's survival is "nothing short of a miracle."

Shells From Captain Cook's Final Voyage Were Rescued From a Dumpster

Long presumed lost, the collection of rare shells is now on display in England

A dugong, also known as a sea cow, in a protected marine reserve in the Philippines. On the mammal’s underside, remora fish snack on parasites—and dugong poop.

The Dugong, a Huggable, Seagrass-Loving Sea Cow, Has a New Best Friend: Drones

Keeping tabs on the species' populations is surprisingly hard. A new aerial effort tracks the marks they leave behind

A sea otter basks in the water with some kelp. Sea otter populations plummeted as they were killed for their pelts in the 18th and 19th centuries.

Hungry Sea Otters Help Prevent Erosion on California's Coast

The marine mammals, which were once hunted nearly to extinction, feed on crabs that would make the land more susceptible to erosion by digging holes in the soil and eating roots

A mother "Dorado" octopus, one of the newly announced species, protects her eggs some 3,000 meters under the ocean's surface.

Biologists Discover Four New Octopus Species in the Deep Ocean Off Costa Rica

One species was found brooding eggs near low-temperature hydrothermal vents, a rare sight that could unlock new information on deep-sea cephalopods

Researchers examined how key genes behave across the sea star body by staining genetic material with fluorescent labels.

A Starfish 'Body' Is Just One Giant Head, Study Finds

Genes associated with the torso are largely absent in a species of starfish, upending how scientists perceive these creatures

Alaska canceled its snow crab harvest for two seasons in a row.

Why Ten Billion Snow Crabs Disappeared Off the Coast of Alaska

The unprecedented die-off represents roughly 90 percent of the eastern Bering Sea population

A killer whale in the Salish Sea is observed harassing a porpoise.

Why Do Orcas Keep Harassing Porpoises?

An endangered group of killer whales in the Pacific Northwest has been toying with porpoises for decades—and new research offers some possible explanations

Adult dugong swimming and feeding in the shallow water of the Red Sea. 

Dugong Populations Are Declining in the Great Barrier Reef, Study Finds

Destruction of seagrass habitats and "indiscriminate" gillnet fishing have both contributed to the marine mammals' dropping numbers, scientists say

A nesting Hawaiian green sea turtle, or honu in Hawaiian, struggles while trapped in a hole in the sea wall on Tern Island in 2014. This female was rescued, but in 2021 at least seven females died after being trapped on the island.

The Lonely Battle to Save Species on a Tiny Speck in the Pacific

As Tern Island, a former military outpost in the Hawaiian archipelago, falls apart and harms turtles, birds, seals and more, scientists wonder what’s next

A sea lion receiving care at the Pacific Marine Mammal Center in Laguna Beach, California, shows signs of domoic acid poisoning.

Algae Is Making Sea Lions More Aggressive in California

A toxin present in algal blooms is moving through the food chain, leading to the deaths of sea lions and dolphins

Brooding octopuses at a previously unexplored site in the Pacific Ocean, off the western coast of Costa Rica

Scientists Find Rare Deep-Sea Octopus Nurseries

The team captured footage of the eight-armed creatures brooding their eggs in groups near Costa Rica

A 1658 map of Iceland, reprinted from Abraham Ortelius’ Theatrum Orbis Terrarum, includes a sea monster known for catching its fish through cunning.

What Medieval Manuscripts Reveal About the Hidden History of Whales

A clever cetacean feeding trick may have launched a legend

Red knots feed on horseshoe crab eggs along the shore at Mispillion Harbor, Delaware.

Red Knot Shorebird Numbers Rise in New Jersey

An independent survey counted 22,000 of the federally threatened birds, up from a historic low of 6,880 in 2021

This is the first documented rainbow sea slug in a rock pool in the United Kingdom.

Rare 'Technicolor' Rainbow Sea Slug Found in England

It's only the fourth record of the species in the U.K., and experts say it's a sign of warming waters due to climate change

Researchers Jessica Farrell and Sean Goggin collect water samples at Moultrie Creek in St. Augustine, Florida.

Scientists Can Now Pull Human DNA From Air and Water, Raising Privacy Questions

Environmental DNA helps monitor elusive and endangered animals, but it could be an ethical minefield when used with humans, new study shows

A high-temperature hydrothermal vent field discovered on Puy des Folles Seamount on the Mid-Atlantic Ridge at approximately 6,562 feet in depth.

See the Breathtaking Ocean Life Found at Deep-Sea Vents

An international team of scientists discovered new hydrothermal vents along the Mid-Atlantic Ridge releasing mineral-rich water hot enough to melt lead

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

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