Dolphin and Whale News ArticlesExcerpts of key news articles on dolphins and whales
Two dolphins have been recorded having a conversation for the first time after scientists developed an underwater microphone which could distinguish the animals' different "voices". Researchers have known for decades that the mammals had an advanced form of communication. But scientists have now shown that dolphins alter the volume and frequency of pulsed clicks to form individual "words" which they string together into sentences in much the same way that humans speak. Researchers at the Karadag Nature Reserve, in Feodosia, Ukraine, recorded two Black Sea bottlenose dolphins, called Yasha and Yana, talking to each other in a pool. Each dolphin would listen to a sentence of pulses without interruption, before replying. Lead researcher Dr Vyacheslav Ryabov, said: “Essentially, this exchange resembles a conversation between two people. “Each pulse represents a phoneme or a word of the dolphin's spoken language. “The analysis of numerous pulses registered in our experiments showed that the dolphins took turns in producing [sentences] and did not interrupt each other, which gives reason to believe that each of the dolphins listened to the other's pulses before producing its own. “This language exhibits all the design features present in the human spoken language. This indicates a high level of intelligence and consciousness in dolphins. Their language can be ostensibly considered a highly developed spoken language, akin to the human language.”
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My research team and I were following a school of bottlenose dolphins near shore ... off Los Angeles, California. The dolphins were still feeding in circle near shore, when suddenly, one individual changed direction heading out toward deeper water. A minute later, the rest of the school turned to follow. Seeing them abruptly leave a foraging ground and change direction came as a surprise to the research team. I decided to follow them. The dolphins increased their speed. Somewhere near three miles offshore the dolphin group stopped, forming a sort of ring around a dark object in the water. “Someone’s in the water!” yelled my assistant, standing up and pointing at the seemingly lifeless body of a girl. As the boat neared, she feebly turned her head toward us, half-raising her hand as a weak sign for help. If we didn’t act immediately, the girl would die. We [pulled] the frail and hypothermic body on board. “She is cyanotic,” said one of my researchers, also a lifeguard, after a cursory examination. “She has severe hypothermia. We need to get her warm!” We managed to get some of her wet garments off and wrap her in a blanket. We took turns keeping her warm by huddling with her under the blanket. A couple of hours later, we were all waiting outside the emergency room at the Marina del Rey hospital. The ER doctor came out to talk with us. The girl, it seems, would pull through, and he thanked us for our quick action. He tells us the girl was vacationing in L.A. from Germany and, as the letter found in her plastic bag explained, she was attempting suicide. If we hadn’t found her, if the dolphins hadn’t led us offshore when they did, to that specific place, she would have died.
Note: This article has been adapted from the book Dolphin Confidential: Confessions of a Field Biologist. For more on the amazing capacities of dolphins and other marine mammals, as well as the threats they face from human activities, click here. For a treasure trove of great news articles which will inspire you to make a difference, click here.
They escape from aquarium tanks. They locate underwater mines. Now, a new paper published in the journal Proceedings of the National Academy of Science claims that dolphins recognized their own name when called. Vincent Janik, one of the authors of the study and a biology researcher at the University of St. Andrews in Scotland, said that the name is actually a specific type of dolphin vocalization that the animals respond to. "They're these high pitched whistles that have a little bit of a melody," he told ABC News. These sounds are referred to as "signature whistles." Janik and his colleague, Stephanie King, cruised along the east coast of Scotland looking for bottlenose dolphins. After spotting and identifying a dolphin in the wild, the researchers would play one of three different sounds: a modified sound clip of that dolphin's signature whistle, a signature whistle of one of its podmates, or the signature whistle of a completely foreign dolphin. They played the dolphin's own signature whistle and the animal would come up and approach the boat and whistle back. However, the dolphin didn't respond to the other two types of whistles and mostly kept about its business. It may seem odd that the dolphins don't react much to the whistles of their fellow herdmates, but Janik says that copying a dolphin's signature whistle just right is part of their social group. "This copying only occurs between closely associated animals, like between mothers and their calves," he said. Dolphins only need to respond to their own signature whistles, since any socially relevant animal will have learned how to copy it. "It says to them, 'I know that this [whistle] is a friend.'"
Whales flee from the loud military sonar used by navies to hunt submarines, new research has proven for the first time. The studies provide a missing link in the puzzle that has connected naval exercises around the world to unusual mass strandings of whales and dolphins. Beaked whales, the most common casualty of the strandings, were shown to be highly sensitive to sonar. But the research also revealed unexpectedly that blue whales, the largest animals on Earth and whose population has plummeted by 95% in the last century, also abandoned feeding and swam rapidly away from sonar noise. The strong response observed in the beaked whales occurred at noise levels well below those allowed for US navy exercises. "For whales and dolphins, listening is as important as seeing is for humans they communicate, locate food, and navigate using sound," said Sarah Dolman, at charity Whale and Dolphin Conservation. "Noise pollution threatens vulnerable populations, driving them away from areas important to their survival, and at worst injuring or even causing the deaths of some whales and dolphins." Dolman said there were no accepted international standards regarding noise pollution and there was an urgent need to re-evaluate the environmental impacts of military activities. Unusual mass strandings, where multiple species of whale and dolphin beach at several locations at once, have soared since the introduction of military sonar in the 1950s and can be fatal. The strandings occur every year and major recent events saw up to 15 animals beached in the Canary Islands, the Bahamas and Greece.
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The ocean depths have become a noisy place. The causes are human: the sonar blasts of military exercises, the booms from air guns used in oil and gas exploration, and the whine from fleets of commercial ships that relentlessly crisscross the global seas. Marine experts say the rising clamor is particularly dangerous to whales, which depend on their acute hearing to locate food and one another. To fight the din, ... the National Oceanic and Atmospheric Administration seeks to document human-made noises in the ocean and transform the results into the worlds first large sound maps. Its a first step, Leila T. Hatch, a marine biologist and one of the projects two directors, said of the sound maps. No ones ever done it on this scale. Michael Jasny, a senior policy analyst with the Natural Resources Defense Council, [which] has sued the Navy to reduce sounds that can harm marine mammals, praised the maps as magnificent and their depictions of sound pollution as incredibly disturbing. Legal experts say the new findings are likely to accelerate efforts both domestically and internationally to deal with the complicated problem through laws, regulations, treaties and voluntary noise reductions. The Navy estimates that blasts from its sonars used in training and to hunt enemy submarines result in permanent hearing losses for hundreds of sea mammals every year and temporary losses for thousands. All told, annually the injured animals number more than a quarter million.
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Environmental groups sued the Obama administration ... for granting the Navy permits to test underwater sonar along the West Coast -- and potentially harass up to 650,000 porpoises, seals, dolphins and whales over a five-year period. The alliance said it wasn't seeking to stop the testing but to scale it back, especially at certain times and in waters important for feeding and giving birth. Several studies have found that marine mammals can hear low-frequency sonar, which is magnified under water, and periodically dolphins and even whales have been found with perforated ear drums. The National Marine Fisheries Service "fell down on the job and failed to require the Navy to take reasonable and effective actions to protect" marine mammals, Steve Mashuda, an attorney for the law firm Earthjustice, said. The lawsuit ... claims that the Navy's sonar use might be strong enough to kill the animals outright. But even if it doesn't, it claims, the repeated use of sonar in certain critical habitats is unwarranted. In 2010, the fisheries service approved the Navy's five-year plan for operations in the Northwest Training Range Complex, an area roughly the size of California that stretches from Washington state to Northern California. Under the five-year plan, the service said it was acceptable for the Navy to incur up to 650,000 cases of harassment of marine mammals.
Note: Sonar can drive drive marine mammals insane with the intensity of noise. Imagine a huge siren right next to your ears. You would certainly flee to try to get away. This is likely what is causing many of the whale and dolphin strandings. How much sound does it take to perforate an ear drum, as is mentioned in this article? For more on threats to marine mammals, see the deeply revealing reports from reliable major media sources available here.
With the Biden administration’s mandate to slash carbon emissions “at least in half by the end of the decade,” the Pentagon has committed to using all-electric vehicles and transitioning to biofuels for all its trucks, ships and aircraft. The plan ignores the Pentagon’s continuing role in the annihilation of whales, in spite of the miraculous role that large cetaceans have played in delaying climate catastrophe and “maintaining healthy marine ecosystems,” according to a report by Whale and Dolphin Conservation. This fact has mostly gone unnoticed. The decimation of populations of whales and dolphins over the last decade - resulting from the year-round, full-spectrum military practices carried out in the oceans ... has fast-tracked us toward a cataclysmic environmental tipping point. The other imminent danger that whales and dolphins face is from the installation of space-war infrastructure, which is taking place currently. This new infrastructure comprises the development of the so-called “smart ocean,” rocket launchpads, missile tracking stations and other components of satellite-based battle. Throughout their lives, whales enable the oceans to sequester a whopping 2 billion metric tons of carbon dioxide per year. That astonishing amount in a single year is nearly double the 1.2 billion metric tons of carbon that was emitted by the U.S. military in the entire 16-year span between 2001 and 2017. Clearly, key path forward toward a livable planet is to make whale and ocean conservation a top priority.
Some 477 pilot whales have died after stranding themselves on two remote New Zealand beaches over recent days, officials say. None of the stranded whales could be refloated and all either died naturally or were euthanized in a “heartbreaking” loss, said Daren Grover, the general manager of Project Jonah, a nonprofit group which helps rescue whales. The whales beached themselves on the Chatham Islands, which are home to about 600 people and located about 800 kilometers (500 miles) east of New Zealand's main islands. The Department of Conservation said 232 whales stranded themselves Friday at Tupuangi Beach and another 245 at Waihere Bay on Monday. The deaths come two weeks after about 200 pilot whales died in Australia after stranding themselves on a remote Tasmanian beach. Mass strandings of pilot whales are reasonably common in New Zealand, especially during the summer months. Scientists don't know exactly what causes the whales to strand, although it appears their location systems can get confused by gently sloping sandy beaches. Grover said there is a lot of food for the whales around the Chatham Islands, and as they swim closer to land, they would quickly find themselves going from very deep to shallow water. “They rely on their echolocation and yet it doesn't tell them that they are running out of water,” Grover said. “They come closer and closer to shore and become disoriented. The tide can then drop from below them and before they know it, they're stranded on the beach.”
Note: What so many articles on the mass whale strandings fail to mention is military devices which are known to damage echolocation abilities. As this article states, “The low frequency active sonar (LFA sonar) used by the military to detect submarines is the loudest sound ever put into the seas. Yet the U.S. Navy is planning to deploy LFA sonar across 80 percent of the world ocean. At an amplitude of 240 decibels, it is loud enough to kill whales and dolphins and has already caused mass strandings and deaths in areas where U.S. and/or NATO forces have conducted exercises.”
During a normal summer, Glacier Bay and the surrounding area buzzes with traffic, as vessels of all sizes, from massive, 150,000-tonne cruise liners to smaller whale-watching boats, ply the waters as part of Southern Alaska's massive tourism industry. The Covid-19 pandemic brought all of that to a sudden halt. Overall marine traffic in Glacier Bay declined roughly 40%. According to research by [Christine] Gabriele and Cornell University researcher Michelle Fournet, the level of manmade sound in Glacier Bay last year dropped sharply from 2018 levels, particularly at the lower frequencies generated by the massive cruise ship engines. Peak sound levels were down nearly half. All this afforded researchers an unprecedented opportunity to study whale behaviour in the kind of quiet environment that hasn't existed in the area for more than century. Gabriele has already noted changes. She compared whale activity in pre-pandemic times to human behaviour in a crowded bar. They talk louder, they stay closer together, and they keep the conversation simple. Now, the humpbacks seem to be spreading out across larger swathes of the bay. Whales can hear each other over about 2.3km (1.4 miles), compared with pre-pandemic distances closer to 200m (650ft). That has allowed mothers to leave their calves to play while they swim out to feed. Some have been observed taking naps. And whale songs - the ghostly whoops and pops by which the creatures communicate - have become more varied.
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In the depths of the ocean, and out of sight for most of us, there’s a quiet miracle happening. Many humpback whale populations, previously devastated by commercial whaling, are making a comeback. A recent study on humpbacks that breed off the coast of Brazil and call Antarctic waters home during the summer has shown that these whales can now be found in the sort of numbers seen before the days of whaling. Records suggest that in the 1830s there were around 27,000 whales but, after heavy hunting, by the mid-1950s only 450 remained. It is reassuring to see what happens when we leave nature to follow its course. The ban of commercial whaling in 1986 led to a strong recovery and now this population is thought to be around 93% of its original size. By taking away the threat of hunting, and having safe spaces to survive and thrive, humpback numbers in many areas have recovered. This is great news for the whales, of course, but also for the climate. Keeping carbon out of the atmosphere is key to tackling the climate crisis and the contribution that a single whale can make is something we need to take seriously. On average a single whale stores around 33 tonnes of CO2. If we consider only the Antarctic humpback whales that breed in Brazil, protecting this population alone has resulted in 813,780 tonnes of CO2 being stored in the deep sea. That’s around twice the yearly CO2 emissions of a small country like Bermuda or Belize, according to 2018 emissions data.
A federal appeals court ruled Friday that the U.S. Navy was wrongly allowed to use sonar that could harm whales and other marine life. The Ninth U.S. Circuit Court of Appeals reversed a lower court decision upholding approval granted in 2012 for the Navy to use low-frequency sonar for training, testing and routine operations. The five-year approval covered peacetime operations in the Pacific, Atlantic, and Indian Oceans and the Mediterranean Sea. Sonar, used to detect submarines, can injure whales, seals, dolphins and walruses and disrupt their feeding and mating. The 2012 rules adopted by the National Marine Fisheries Service permitted Navy sonar use to affect about 30 whales and two dozen pinnipeds, marine mammals with front and rear flippers such as seals and sea lions, each year. The Navy was required to shut down or delay sonar use if a marine mammal was detected near the ship. Loud sonar pulses also were banned near coastlines and in certain protected waters. Environmental groups, led by the Natural Resources Defense Council, filed a lawsuit in San Francisco in 2012, arguing that the approval violated the Marine Mammal Protection Act. The appellate court ruled 3-0 that the approval rules failed to meet a section of the protection act requiring peacetime oceanic programs to have "the least practicable adverse impact on marine mammals." The panel concluded that the fisheries service "did not give adequate protection to ... the world's oceans."
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Conservationists counted 615 dead dolphins along a 90-mile stretch of beaches in Peru ... and the leading suspect is acoustic testing offshore by oil companies. "If you can count 615 dead dolphins, you can be sure there are a great many more out at sea and the total will reach into the thousands, Hardy Jones, head of the conservation group BlueVoice.org, said in a statement after he and an expert with ORCA Peru walked the beaches. BlueVoice.org stated that "initial tests ... show evidence of acoustical impact from sonic blasts used in exploration for oil." The ORCA Peru expert, veterinarian Carlos Yaipen Llanos, said that while "we have no definitive evidence," he suspects acoustic testing created ... a sonic blast that led to internal bleeding, loss of equilibrium and disorientation. Another possibility is that the dolphins suffered from a disease outbreak, Yaipen Llanos said. "It is a horrifying thought that these dolphins would die in agony over a prolonged period if they were impacted by sonic blast," said Jones. Numerous dolphins first started washing ashore in January, with the largest amount coming in early February. Thousands of dead anchovies were also seen. BlueVoice.org noted that the U.S. has suspended similar testing in the Gulf of Mexico due to recent sightings of dead and sick dolphins. The ban was set to last through the dolphins' calving season, which ends in May.
Note: A San Francisco Chronicle article on this a few days later states, "All of the 20 or so animals ... examined showed middle-ear hemorrhage and fracture of the ear's periotic bone. ... Most of the dolphins apparently were alive when they beached." Clearly sonic blasts of some sort are driving these intelligent animals to beach themselves and commit suicide. For clear evidence this is the result of oil exploration, click here. For many other excellent media articles on whales on dolphins, click here.
Scientists have now documented behaviors like tool use and cooperative hunting strategies among whales. Orcas, or killer whales, have been found to mourn their own dead. Just three years ago, researchers at Mount Sinai School of Medicine in New York discovered, in the brains of a number of whale species, highly specialized neurons that are linked to, among other things, the use of language and were once thought to be the exclusive property of humans and a few other primates. Indeed, marine biologists are now revealing not only the dizzying variety of vocalizations among a number of whale species but also complex societal structures and cultures. Whales, we now know, teach and learn. They scheme. They cooperate, and they grieve. They recognize themselves and their friends. They know and fight back against their enemies. And perhaps most stunningly, given all of our transgressions against them, they may even, in certain circumstances, have learned to trust us. For all of their inherent elusiveness, the gray whales of Baja baffle scientists for the opposite reason: They cant seem to get enough of us humans. The question of why present-day gray-whale mothers, some of whom still bear harpoon scars, would take to seeking us out and gently shepherding their young into our arms is a mystery that now captivates whale researchers and watchers alike. There may be something far more compelling going on in the lagoons of Baja each winter and spring. Something, lets say, along the lines of that time-worn plot conceit behind many a film, in which the peaceable greetings of alien visitors are tragically rebuffed by human fear and ignorance. Except that in this particular rendition, the aliens keep coming back, trying, perhaps, to give us another chance.
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Good news doesn’t get any more in-your-face than this. One thousand fin whales, one of the world’s biggest animals, were seen last week swimming in the same seas in which they were driven to near-extinction last century due to whaling. It’s like humans never happened. This vast assembly was spread over a five-mile-wide area between the South Orkney islands and the Antarctic Peninsula. A single whale is stupendous; imagine 1,000 of them, their misty forest of spouts, as tall as pine trees, the plosive sound of their blows, their hot breath condensing in the icy air. Their sharp dorsal fins and steel-grey bodies slide through the waves like a whale ballet, choreographed at the extreme south of our planet. The sight has left whale scientists slack-jawed and frankly green-eyed in envy of Conor Ryan, who observed it from the polar cruiser, National Geographic Endurance. Ryan, an experienced zoologist and photographer, says this may be “one of the largest aggregations of fin whales ever documented”. His estimate of 1,000 animals is a conservative one, he says. Fin whales are surprisingly slender, serpentine creatures when you see them underwater, and so long that they seem to take for ever to swim past. Like blue, humpback and minke whales, they’re baleen whales, distinguished by food-filtering keratinous plates in lieu of teeth. Unlike toothed whales, such as sperm whales and killer whales, they are not usually seen as social animals.
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The US navy set off a massive explosion last week, detonating a 40,000lb blast as part of a test to determine whether its newest aircraft carrier, the USS Gerald Ford, is ready for war. The test, known as a full ship shock trial, is just the first of three planned blasts over the coming months. But the amount of explosive used – 40,000 lbs – is enough to have outsized effects on any marine life in the area, said Michael Jasny, who directs the Natural Resources Defense Council’s Marine Mammal Protection Project. “The navy’s own modeling indicates that some smaller species of marine mammals would be expected to die within 1-2km of the blast, and that some marine mammal species would suffer injury including hearing loss out to 10km of the blast. That gives some sense of the power of the explosives we are talking about,” Jasny said. “We don’t know how conscientiously the blast site was chosen, and we don’t know how effective the monitoring was before the detonation, so it’s hard to put a great deal of faith in the safety of marine life.” The area is home to populations of dolphin and small whales at this time of year, and Jasny says that’s worrisome because as a general rule, smaller animals are more vulnerable to blast injury. “A large whale might need to be within a few hundred meters of the blast to die, while a small mammal could be a couple of kilometers away,” he said, adding that even if the animals survive, loss of hearing is a significant problem for mammals who make their living in the ocean.
Scientists say they have seen a remarkable collection of blue whales in the coastal waters around the UK sub-Antarctic island of South Georgia. Their 23-day survey counted 55 animals - a total that is unprecedented in the decades since commercial whaling ended. To witness 55 of them now return to what was once a pre-eminent feeding ground for the population has been described as "truly, truly amazing" by cetacean specialist Dr Trevor Branch. "To think that in a period of 40 or 50 years, I only had records for two sightings of blue whales around South Georgia. So to go from basically nothing to 55 in one year is astonishing," he told BBC News. Blue whales are the most massive creatures ever to roam the Earth, and the Antarctic sub-species contained the very biggest of the big at over 30m. This population was also the most numerous of the 10 or so discrete populations across the globe, carrying perhaps 239,000 individuals prior to the onset of industrial exploitation. But the marine mammals' physical size made them a profitable catch, and around South Georgia more than 33,000 Antarctic blues were documented to have been caught and butchered, most of them between 1904 and 1925. By the time a ban was introduced in 1966, a sighting anywhere in Southern Ocean waters would have been extremely rare indeed. The last official estimate of abundance was made in 1997 and suggested Antarctic blues could have recovered to about 2,280 individuals.
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In the depths of the ocean, and out of sight for most of us, theres a quiet miracle happening. Many humpback whale populations, previously devastated by commercial whaling, are making a comeback. A recent study on humpbacks that breed off the coast of Brazil and call Antarctic waters home during the summer has shown that these whales can now be found in the sort of numbers seen before the days of whaling. In the 1830s there were around 27,000 whales but, after heavy hunting, by the mid-1950s only 450 remained. It is reassuring to see what happens when we leave nature to follow its course. The ban of commercial whaling in 1986 led to a strong recovery and now this population is thought to be around 93% of its original size. By taking away the threat of hunting, and having safe spaces to survive and thrive, humpback numbers in many areas have recovered. This is great news for the whales, of course, but also for the climate. Keeping carbon out of the atmosphere is key to tackling the climate crisis and the contribution that a single whale can make is something we need to take seriously. A single whale stores around 33 tonnes of CO2. If we consider only the Antarctic humpback whales that breed in Brazil, protecting this population alone has resulted in 813,780 tonnes of CO2 being stored in the deep sea. Thats around twice the yearly CO2 emissions of a small country. When a whale dies naturally, it exports carbon stored in its gigantic body to the deep sea, keeping it locked up for centuries.
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[Humpbacks whales] deliberately interfere with attacking killer whales to help others in distress. They dont just defend their own babies or close relatives. They intervene on behalf of other species - a gray whale calf with its mother, a seal hauled out on an ice floe, even an ocean sunfish. Humpbacks act to improve the welfare of others; the classic definition of altruism. Robert Pitman, a marine ecologist ... describes a pivotal encounter he witnessed in Antarctica in 2009. A group of killer whales washed a Weddell seal they were attacking off an ice floe. A pair of humpbacks ... inserted themselves into the action. One of the huge humpbacks rolled over on its back and the 180-kilogram seal was swept up onto its chest between the whales massive flippers. And when the seal started slipping off, the humpback, according to Pitman, gave the seal a gentle nudge with its flipper, back to the middle of its chest. Moments later, the seal scrambled off and swam to the safety of a nearby ice floe. Pitman started asking people to send him similar accounts. Soon he was poring through observations of 115 encounters between humpbacks and killer whales, recorded over 62 years. So are humpbacks compassionate? When I pose the ... question to Pitman he [responds], When a human protects an imperiled individual of another species, we call it compassion. If a humpback whale does so, we call it instinct. But sometimes the distinction isnt all that clear.
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One of the stories that inspired bestselling author Susan Caseys new book on the intricate world of dolphins, Voices in the Ocean, is almost too beautiful to be believed. A biologist named Maddalena Bearzi was studying a group of dolphins off the coast of Los Angeles when she noticed something strange. The pod (group of dolphins) had just landed upon a herd of sardines. They were about to start feeding when one, unexpectedly, darted off. The rest followed, swimming full speed out to sea. When she reached them, three miles offshore, the pod had a formed a circle - in the middle of it, a girls floating body. Very near death, the girl had a plastic bag with her identification and a suicide note wrapped around her neck. With the dolphins' help, she was saved. The first dolphins lived on land. It took them 25 million years to adapt to being in the water. Their bodies shrank and their teeth shrank and their brains got big. They did all kinds of shape-shifting evolutionarily. Their brains grew significantly. Its fascinating because scientists dont know why. Most scientists main guess is that it was due to their changing social behavior. How did the dolphin know the girl was there? Thats the big question. They dont rely on vision. I suspect it had something to do with frequency and vibration but of course thats a guess. We dont know. They tend to treat us the way they would treat other dolphins. By themselves, theyre vulnerable - to sharks, getting lost, all these things. So when you see dolphins together there is constant touching. They know how to help each other.
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Environmental organizations filed a lawsuit [on December 16] against the National Marine Fisheries Service to demand it force the Navy to consider alternatives to its five-year plan that will intensify its sonar use off Southern California and Hawaii. Earthjustice, representing several groups, filed the lawsuit ... only hours after the federal agency announced it had decided to grant the Navy permits to move ahead with its plans for training and testing in the Pacific. Environmentalists [favor] creating zones that would be off-limits to biologically sensitive areas [and] want the Navy to avoid training in certain spots seasonally when they are rich in marine life. "The science is clear: sonar and live-fire training in the ocean harms marine mammals," said Marsha Green of Ocean Mammal Institute. "There are safer ways to conduct Navy exercises that include time and place restrictions to avoid areas known to be vital for marine mammals' feeding, breeding and resting." Reported mass strandings of beaked whales have increased around the world since the military started using sonar more than half a century ago. The sounds can scare animals into shallow waters where they can become disoriented and wash ashore. Aside from beachings, biologists are concerned about prolonged stress from changes in diving, feeding and communication habits. Two recent studies off the Southern California coast found certain endangered blue whales and beaked whales stopped feeding and fled from recordings of noise similar to military sonar. Beaked whales are highly sensitive to sound and account for the majority of strandings near military exercises.
Note: Consider that naval sonar doesn't "scare" marine mammals, but rather drives them insane with the intensity of noise. Imagine a huge siren right next to your ears. You would certainly flee to try to get away. This is likely what is causing many of the whale and dolphin strandings. Studies have found stranded animals to have perforated ear drums, as you can read in this NBC News article. How much sound does it take to perforate an ear drum? For more on threats to marine mammals, see the deeply revealing reports from reliable major media sources available here.
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