Conservationists train dolphins held in abusive captivity for years to return to the sea. CNN's Ivan Watson reports.
Two dolphins who were rescued from a filthy pool at a Turkish tourism resort were released back into the wild this week after years in captivity.
Newer threats, such as pirate skiffs chasing freighters and desperate regimes mining harbors, have intensified the U.S. Navy's need to handle an array of "real-world" scenarios.
A new iPhone app is making waves in the commercial shipping world by providing an early warning system that aims to reduce maritime collisions with endangered whales.
Environmental authorities are investigating the deaths of more than 800 dolphins that have washed up on the northern coast of Peru this year.
Coastal areas that ban fishing can provide havens for endangered wildlife, according to a new report.
Jane Velez-Mitchell talks to Marine Mammal Specialist Ric O'Barry about the troubling trend of dolphin deaths in Cape Cod.
The number of unexplained dolphin deaths on Cape Cod, Massachusetts, rose Friday, with rescuers tallying the toll at 103.
Scientists are baffled why so many dolphins are washing up along Cape Cod. CNN's Mary Snow reports.
The unexplained beachings of scores of dolphins over the past month along Cape Cod, Massachusetts, is the largest "single-species event" of its kind on record in the northeastern United States, a marine mammal specialist said Monday.
Thad Lacinak, former SeaWorld employee, responds to a PETA lawsuit claiming SeaWorld is enslaving killer whales.
At least 81 dolphins have been found dead or died shortly after being discovered on Cape Cod in a series of largely unexplained strandings that began early last month, according to the National Oceanic and Atmospheric Administration.
Rescuers work to save nine dolphins that were found stranded off the coast of Cape Cod. WWLP reports.
The environmental group Sea Shepherd has offered a $10,000 reward for information that leads to the conviction of those responsible for shooting at least seven sea lions in Washington's Puget Sound.
For many millions of years, the oceans have been filled with the sounds of a geologically and biologically active planet: waves, rain, earthquakes and the songs of life from snapping shrimp to great whales. Before the age of engine-driven ships, the resounding voices of the great whales could be heard across an ocean.
Environmental campaign group Greenpeace has warned that if oil leaks from the stricken cruise liner Costa Concordia it could cause an environmental disaster, threatening marine life including birds, whales and sharks.
At least 20 dolphins have died after washing up near several Cape Cod towns, an International Fund for Animal Welfare spokeswoman said Monday.
Japan on Friday handed over to Australian authorities three anti-whaling activists held aboard a Japanese vessel after illegally boarding the ship to protest Japan's annual whale hunt in Atlantic waters.
Japan said Tuesday that it would hand over to Australian authorities three Australian anti-whaling activists being held aboard a Japanese vessel, but that it would press on with its annual whale hunt in the seas near Antarctica.
Three Australian activists are being held aboard a Japanese ship Monday after illegally boarding the vessel to protest Japan's annual whale hunt in Antarctic waters.
Winter weather greeted southerners as they returned to work Tuesday following the New Year's holiday weekend, with freezing temperatures replacing the surprisingly warm weather of recent days.
Prisoners in ice, more than 100 Beluga whales in far eastern Russia risk death unless rescued soon.
The Japanese government has affirmed that $29 million from its budget for post-earthquake and tsunami reconstruction is going toward extra security measures for the country's whaling fleet, angering environmental activists like Greenpeace.
SeaWorld employees on Tuesday testified at a federal job safety hearing that, while the behavior of killer whales is is extremely predictable, the job of working with a 6-ton marine mammal carries a calculated risk.
CNN's Anderson Cooper talks to author David Kirby about new developments in the SeaWorld hearing.
Can killer whales sue SeaWorld for enslavement?
Onetime nursery school teacher Gale McCullough explains how the photo site Flickr helps her global whale research.
Want to help save the humpback whale? Pick up a camera and start taking pictures, says Gale McCullough, a "fluke matcher" at Allied Whale, a research group.
Japan says it will hunt whales in the Southern Ocean this winter and will send a Fisheries Agency ship to guard its whalers against promised intervention by a conservation group.
CNN's Anderson Cooper talks to experts about a killer whale that killed a trainer at SeaWorld.
A gray whale that spent nearly seven weeks in a northern California river died Tuesday, a sad ending to attempts to get her back to sea.
CNN's Kaj Larsen sees firsthand how the Navy trains dolphins. For more, watch CNN Presents Sunday, July 31, 8p ET/PT.
No matter how many times he steers the 450-passenger Seabourn Sojourn through Norway's Lofoten Islands, captain Hamish Elliott eagerly anticipates his favorite point: the entrance to Trollfjord, a fairytale-like landscape with towering cliffs on either side.
Volunteers and veterinarians caring round the clock for stranded pilot whales were buoyed Saturday evening by news that two were released off the Florida Keys.
Rescuers worked feverishly Friday to save some of the pilot whales who stranded themselves in shallow waters near the Florida Keys.
Volunteers work through the night to save beached pilot whales. WSVN reports
What scientists say is the largest concentration of endangered right whales ever spotted in one location is giving researchers an unusually rich opportunity to study the animals and their feeding habits.
Dead baby bottlenose dolphins are continuing to wash up in record numbers on the shores of the Gulf of Mexico, and scientists do not know why.
The killer whale involved in the death of Sea World trainer Dawn Brancheau returns to work.
Tilikum, the killer whale that killed a SeaWorld trainer last year, has returned to the stage at the Orlando, Florida, theme park. Tilikum made his return appearance Wednesday morning in front of an audience in the "Believe" show.
Tilikum, the killer whale that killed SeaWorld trainer Dawn Brancheau last year, has returned to the stage at the Orlando, Florida theme park.
They are the largest animals on the planet and spend around 90% of their lives underwater, surfacing to breathe for only fleeting moments.
At least 24 infant dolphins have been found dead in the past 2 months. Brooke Baldwin investigates.
Baby bottlenose dolphins are washing up dead in record numbers on the shores of Alabama and Mississippi, alarming scientists and a federal agency charged with monitoring the health of the Gulf of Mexico.
Japan has suspended its annual Antarctic whale hunt because an anti-whaling group is tailing its ship, a government official said Wednesday.
Five months after the Deepwater Horizon explosion unleashed a torrent of oil into the Gulf of Mexico, a male dolphin washed up on Louisiana's Gulf Coast just barely alive.
Nestled in the mountain foothills of a remote province in central Vietnam, one of the country's most important archaeological discoveries in a century has recently come to light.
A 25-year-old killer whale unexpectedly died at SeaWorld in Orlando, Florida, the park said in a statement Tuesday.
For most divers, a shark in the water can inspire fear, or even dread. Greg Marshall wanted to hitch a ride.
Word that a teenager climbed aboard a whale for a ride has sent Australian officials to the beach, to warn others not to try such a stunt.
Polar bears clinging to melting ice sheets have become one of the most frequently used images to portray the perils of climate change.
Workers load the body of a 12-year-old male killer whale on to a truck after it passed away.
Shows at SeaWorld in San Diego, California, are expected to resume on schedule Wednesday, a day after a 12-year-old male killer whale died.
A 12-year-old male killer whale, who showed signs of being ill only the day before, died Tuesday afternoon at SeaWorld in San Diego, California, the park announced.
Dawn Brancheau, the trainer who was killed at Sea World in February, was laid to rest Chicago.
SeaWorld has been fined $75,000 by the Occupational Safety and Health Administration for three safety violations, including one classified as willful, after an animal trainer was killed in February.
A beachgoer in a remote area of northern New Zealand found a horrific sight Friday morning -- 58 pilot whales stranded on Karikari Beach.
Was last year's financial crisis a chance event? Or was it the product of 35 million years of evolution?
Anti-whaling activist Peter Bethune was given a two-year suspended prison sentence and five years' probation Wednesday by a Tokyo district court judge for his role in boarding a Japanese whaling ship.
The family of anti-whaling activist Peter Bethune reacts to the news he'll receive probation and a suspended sentence.
Researchers scanning the Peruvian desert for whale fossils have stumbled upon the remains of a "sea monster" three times the size of a modern day killer whale.
After just two days of closed-door negotiations, the leaders who had gathered at the International Whaling Commission in Agadir, Morocco, announced no agreement was reached on the IWC chair's proposal to improve whale conservation.
The oil disaster in the Gulf of Mexico could trigger a massive manatee rescue. CNN's David Mattingly reports.
With the utmost care and a healthy dose of respect, Monica Ross brought the pontoon boat to a crawl, shut its engine down, and asked for quiet. She was careful not to disturb the small antenna, which floated on the surface of the Crystal River marking the location of Coral, an 800 pound manatee.
Our need for oil almost wiped out the sperm whale once, and now our insatiable hunger for it threatens them again.
A killer whale at SeaWorld Orlando died Sunday while giving birth, the theme park said. The calf was stillborn.
The actor films a PSA asking Obama to help save the whales
It seems that yet another member of the animal kingdom has taken a liking to the iPad -- dolphins.
Australia say diplomacy has failed, so now it's going to court to try and stop Japanese whaling in the Southern Ocean.
Australia is asking an international court to weigh in on Japan's whale-hunting practices, officials said Tuesday.
Anti-whaling activist Peter Bethune testified in a trial Monday that he had no intention of hurting anyone when he protested Japan's whale hunt.
Australia will take its case against Japan's whaling practices to international court early next week, Australian officials said Friday.
A few years ago, weaving in and out of icebergs, a pink dawn rising over a forest of glaciers on the sub-Antarctic island of South Georgia, I realized a childhood dream.
CNN's Randi Kaye reports on why OSHA recanted a report warning of killer whale attacks at SeaWorld.
When it comes to animal exploitation -- follow the money. Using animals for entertainment is big business, plain and simple. The killer whale Tilikum has helped SeaWorld sell millions of dollars worth of tickets.
The 12,000-pound orca removed Dawn Brancheau's arm and part of her scalp
A trendy California sushi restaurant says it's closing after being accused of serving illegal whale meat.
Federal authorities have charged a trendy Santa Monica sushi restaurant with serving whale meat -- an investigation that was spurred by the team behind the Oscar-winning documentary, "The Cove."
A trendy California sushi restaurant charged by federal authorities with serving whale meat offered an apology Monday, saying it "ignored its responsibilities" to endangered species.
The tragic death of a trainer at Sea World last week revived a number of long simmering questions. While we still grapple with "how did this happen?" the central question for many revolves around the role of large mammals -- like Tilikum the killer whale -- in zoos and aquariums: Should they be there or not?
Before I started working on the documentary "The Cove," I assumed like many others that dolphins and orcas enjoyed living at Sea World and other marine parks. They always seemed to be smiling, jumping merrily around their tanks, eager to put on a show for human spectators.
In 2002, a male killer whale, or orca, who had been on public display in concrete tanks for 19 years, swam off on his own into the Atlantic Ocean.
CNN's Kiran Chetry talks to a SeaWorld official about why one of its killer whales turned on his trainer.
Killer whales can weigh up to 22,000 pounds, and may be as long as 32 feet, according to the National Oceanic and Atmospheric Administration. They often travel in groups of up to 50, being highly social.
Dawn Brancheau, the SeaWorld trainer killed by a whale, talked with WESH in 2000 about working with the creatures.
SeaWorld will resume killer whale shows while the company and two federal agencies investigate the death of a whale trainer at SeaWorld Orlando, company and federal officials announced Friday.
SeaWorld announces that whale shows will resume Saturday, but trainers will not be in the water.
The director of an Oscar-nominated documentary about dolphin slaughter says the SeaWorld killer whale attack that left a trainer dead earlier this week could have been prevented.
HLN's Chuck Roberts asks SeaWorld's head whale trainer about events surrounding the tragic death there.
A whale trainer at SeaWorld died from "multiple traumatic injuries and drowning" after a 12,000-pound killer whale grabbed her ponytail and pulled her underwater in front of shocked onlookers at Shamu Stadium, the Orange County Sheriff's office said Thursday.
She lived the life of a little girl's dream.
Dawn Brancheau died of "multiple traumatic injuries and drowning," an autopsy finds
A killer whale killed a trainer Wednesday afternoon at SeaWorld's Shamu Stadium in Orlando, Florida, a public information officer for the Orange County Sheriff's Office said.
Killer whale experts say the whale that killed its trainer may have just wanted to play. CNN's Randi Kaye reports.
Florida's endangered manatees are dying because of unusually cold weather. CNN's David Mattingly reports.
The unusually cold weather that struck Florida in January did more than damage crops and citrus trees.