An example of the blue bioluminescence produced by microscopic organisms called dinoflagellates, which can chemically synthesize their own light

Dolphins, Surfers and Waves Sparkle in Bright Blue Bioluminescent Glow Off California Coast

A rare bloom of microscopic organisms capable of making their own blue light has transformed several of the state’s beaches

Some dolphins are shy, too.

Wild Dolphins Seem to Have a Range of Personalities

From shy to bold with shades in between, dolphin personalities are surprisingly similar to ours

Dolphin Boy Bands Sing 'Pop' Songs in Sync—and the Ladies Want It That Way

Female dolphins, it seems, aren’t immune to the allure of a harmonizing boy band

Dolphins and their calves enjoying a summer day in the lower Potomac River.

Dolphins Are Finally Living and Breeding in the Potomac River Again

About 1,000 bottlenose dolphins have been recorded in the lower reaches of the recovering river, including one that gave birth in August

An Atlantic spotted dolphin swims behind a Pilot whale.

Shedding Genes Helped Whales and Dolphins Evolve for Life at Sea

When adopting an aquatic lifestyle, cetaceans ditched genetic code related to sleep, DNA restoration and more

Dead vaquita entangled in a gillnet set for Totoaba

There Are ‘At Most’ 19 Vaquitas Left in the Wild

An alarming new study documents the continued decline of the critically endangered porpoise—but it may still be possible to save the species

The bottlenose mother, pictured here with her adoptive whale calf and biological daughter, exhibited unusually tolerant behavior

Researchers Document First Known Case of Dolphin Mom Adopting Whale Calf

The melon-headed male whale actively competed for his adoptive mother's attention, repeatedly shoving his bottlenose dolphin sister out of the way

Elusive River Dolphins Caught Chatting Up a Storm

Researchers previously thought the acoustic repertoire of Araguaian river dolphins was relatively limited

Morigenos dolphins.

Cliquey Adriatic Dolphins May Have Strategies for Avoiding Each Other

You can’t swim with us

The fossilized crania of three long-snouted cetaceans.

The Mystery of Ancient Dolphins’ Super-Long Snouts

A new study suggests the extinct cetaceans used their snouts to hit and stun prey, much as swordfish do

This striped dolphin, photographed in the Gulf of Corinth, may be grieving a relative. A new study examines the evidence.

Study Suggests Dolphins and Some Whales Grieve Their Dead

An analysis of 78 instances of cetaceans paying attention to their dead suggests grief may be part of being a highly social animal

When it comes to diving, humans can't hope to keep up with flippered mammals. But an anatomist thinks she may have identified a crucial structure in dolphins that could help humans avoid the bends.

Dolphins Have a Mysterious Network of Veins That Could Be Key to Preventing the Bends

It might be possible to make an external device that protects divers from the deadly condition

English dolphins gliding through their home turf

England Has Its Own Pod of Dolphins

Researchers discover that the group of 28 animals are actually local residents, not just visitors

Scientists Record the Thunderous Call of the Loudest Known Fish

The Gulf corvina’s collective mating call is so powerful that it can damage the hearing of sea lions and dolphins

"Perhaps you'd be interested if I had a sponge?"

Male Humpback Dolphins Woo Mates By Presenting Sponges as Gifts

They also use "wingmen" and occasionally sport the sponges as hats—but researchers aren't sure just how much game they really have

Floating sea pen designed to hold captured vaquitas

Critically Endangered Vaquita Porpoise Dies After Capture in Latest Rescue Effort

Conservationists are attemping a risky last-ditch plan to move the remaining creatures to a sanctuary in the Gulf of California

One of the mine-hunting dolphins being retrained to find vaquita porpoises

Mexico Will Use Dolphins to Herd the Endangered Vaquita to Safety

Mine-hunting dolphins will help researchers transfer the remaining creatures into marine sanctuaries

U.K. Killer Whale Contained Staggering Levels of Toxic Chemical

Lulu had one of the highest concentrations of PCBs ever recorded in a marine mammal

Orcas Are Killed in Front of Tourists, Now Caribbean Nation Wrangles With Whaling Laws

The prime minister of St. Vincent will introduce legislation to outlaw orca hunting

Smithsonian researchers found that otters that use tools aren't closely related.

Unlike Dolphins, Sea Otters That Use Tools Are Not Closely Related

Rock-bashing in otters is a very old behavior

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