Dolphin Deutsch

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Dolphin Deutsch

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Read, a biologist at the Duke University Marine Laboratory who studies dolphin attacks, points out that dolphins are large and wild predators, so people should be more careful when they interact with them.

Several scientists who have researched dolphin behaviour have proposed that dolphins' unusually high intelligence in comparison to other animals means that dolphins should be seen as non-human persons who should have their own specific rights and that it is morally unacceptable to keep them captive for entertainment purposes or to kill them either intentionally for consumption or unintentionally as by-catch.

A number of militaries have employed dolphins for various purposes from finding mines to rescuing lost or trapped humans.

The military use of dolphins , however, drew scrutiny during the Vietnam War when rumors circulated that the United States Navy was training dolphins to kill Vietnamese divers.

Dolphins are still being trained by the United States Navy for other tasks as part of the U. Navy Marine Mammal Program.

The Russian military is believed to have closed its marine mammal program in the early s. In the press reported that dolphins trained to kill by the Soviet Navy had been sold to Iran.

Dolphins are an increasingly popular choice of animal-assisted therapy for psychological problems and developmental disabilities.

For example, a study found dolphins an effective treatment for mild to moderate depression. For example, it is not known whether dolphins are more effective than common pets.

In some parts of the world, such as Taiji, Japan and the Faroe Islands , dolphins are traditionally considered as food, and are killed in harpoon or drive hunts.

Dolphin meat is dense and such a dark shade of red as to appear black. Fat is located in a layer of blubber between the meat and the skin.

When dolphin meat is eaten in Japan, it is often cut into thin strips and eaten raw as sashimi , garnished with onion and either horseradish or grated garlic, much as with sashimi of whale or horse meat basashi.

When cooked, dolphin meat is cut into bite-size cubes and then batter-fried or simmered in a miso sauce with vegetables.

Cooked dolphin meat has a flavor very similar to beef liver. There have been human health concerns associated with the consumption of dolphin meat in Japan after tests showed that dolphin meat contained high levels of mercury.

The Japanese government recommends that children and pregnant women avoid eating dolphin meat on a regular basis. Similar concerns exist with the consumption of dolphin meat in the Faroe Islands , where prenatal exposure to methylmercury and PCBs primarily from the consumption of pilot whale meat has resulted in neuropsychological deficits amongst children.

However, the Faroe Islands populations also eat significant numbers of fish. The study of about Faroese children showed that prenatal exposure to methylmercury resulted in neuropsychological deficits at 7 years of age.

From Wikipedia, the free encyclopedia. Redirected from Dolphins. This article is about the marine mammals. For other uses, see Dolphin disambiguation.

Common dolphin. Bottlenose dolphin. Spotted dolphin. Atlantic spotted dolphin. Commerson's dolphin. Dusky dolphin. Killer whale. Amazon river dolphin.

Main article: Evolution of cetaceans. See also: Cetacean surfacing behaviour. Main article: Cetacean intelligence.

Further information: Sleep non-human. See also: Dolphin drive hunting and Cetacean bycatch. See also: Captive killer whales.

Main article: Military dolphin. January 24, A Greek-English Lexicon. Perseus Digital Library. Retrieved December 17, Retrieved June 28, Marshall Cavendish.

November 1, Retrieved July 23, November Lerner Publications. Read Voyageur Press. Retrieved January 15, Courier Dover Publications.

Discovering Dolphins. Records of 'blackfish' killer, false killer, pilot, pygmy killer, and melon-headed whales in the Indian Ocean Sanctuary, — in Cetaceans and cetacean research in the Indian Ocean Sanctuary.

Archived from the original on November 14, Retrieved November 4, September 15, Archived from the original on September 29, Archived from the original on November 10, Texas Tech University.

Archived from the original on September 15, Retrieved December 8, Archived from the original on July 23, Herzing; Kelly Moewe; Barbara J.

Brunnick Archived from the original PDF on June 14, April 15, Associated Press. Archived from the original on April 17, Retrieved March 2, Retrieved December 21, Houghton Mifflin Harcourt.

Annual Review of Ecology and Systematics. University of Berkeley. Retrieved July 25, Bibcode : Natur.

Bibcode : PNAS.. BBC News. May 8, Retrieved August 20, Walking with Prehistoric Beasts. Discovery Channel. University of Washington: — June Journal of Mammalian Evolution.

November 8, National Geographic. Retrieved July 27, University of Arizona. Retrieved August 29, Proceedings of the National Academy of Sciences.

Sexual Dimorphism PDF. Archived from the original PDF on July 25, American Cetacean Society. November 28, Archived from the original PDF on August 7, Retrieved December 20, Sound production in cetaceans is a complex phenomenon not fully understood by scientists.

Hvalraadets Skrifter. Edward; Hume, Ian D. Comparative Physiology of the Vertebrate Digestive System. Cambridge University Press.

Perrin; Bernd Wursig; J. Thewissen February 26, Encyclopedia of Marine Mammals. Academic Press. Howard December 1, Dolphin Chronicles.

Random House Digital, Inc. Retrieved November 26, Würsig; Bernd Wursig, Melany Wursig Gibbons Jr. SUNY Press. June 27, Retrieved August 12, June 26, Archived from the original on August 12, Retrieved September 12, Comparative Biochemistry and Physiology.

The Anatomical Record. February 26, In Webster, Douglas B. The Evolutionary Biology of Hearing. Retrieved March 1, Thomas; Ronald A. NY: Plenum.

Retrieved March 11, Texas Marine Mammal Stranding Network. Archived from the original on February 6, Retrieved November 20, May 21, Anatomical Record.

Archived from the original on January 6, Retrieved March 12, Retrieved July 8, CBC News. November 24, Retrieved November 8, Yale University Press.

Retrieved March 16, The Daily Telegraph. Retrieved February 11, The Associated Press. National Geographic News.

January 28, Retrieved December 30, Archived from the original on November 11, Archived from the original PDF on March 16, Whales and Dolphins of the World.

New Holland Publishers. Perrin; S. Reilly Vasey Homosexual Behaviour in Animals — an Evolutionary perspective.

Connor; R. Smolker; A. Richards Two levels of alliance formation among male bottlenose dolphins PDF. Cetaceans that are typically lonely and seek human company.

Santos; R. Pierce March 8, Archived from the original on March 13, Nissani's presentation at the International Ethological Conference".

Retrieved February 13, Retrieved June 25, Discovery News. Retrieved September 19, December 6, The Sonar of Dolphins.

July 22, Journal of Comparative Physiology. August 24, Griffiths Caldwell et al. Journal of Comparative Psychology.

Integrative and Comparative Biology. Interpreting the behavioural repertoire of bottlenose dolphins Tursiops sp. Retrieved September 8, Archived from the original PDF on June 10, Retrieved August 2, Deakos et al.

WAToday February 8, Retrieved June 9, Retrieved April 6, Science Sushi. New York Times Magazine. Trends Cogn Sci. University of California San Diego.

Retrieved August 9, Orlando Sentinel. March 7, Scientific American. Live Science. October 30, The New York Times. Retrieved August 3, Consciousness and Cognition.

Lessons from cleaner wrasse and other species. Marine mammals. Moscow: Nauka. Sleep Mechanisms. Experimental Brain Research.

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In humans, the middle ear works as an impedance equalizer between the outside air's low impedance and the cochlear fluid's high impedance.

In dolphins, and other marine mammals, there is no great difference between the outer and inner environments.

Instead of sound passing through the outer ear to the middle ear, dolphins receive sound through the throat, from which it passes through a low-impedance fat-filled cavity to the inner ear.

The dolphin ear is acoustically isolated from the skull by air-filled sinus pockets, which allow for greater directional hearing underwater. This melon consists of fat, and the skull of any such creature containing a melon will have a large depression.

This allows dolphins to produce biosonar for orientation. The dolphin eye is relatively small for its size, yet they do retain a good degree of eyesight.

As well as this, the eyes of a dolphin are placed on the sides of its head, so their vision consists of two fields, rather than a binocular view like humans have.

When dolphins surface, their lens and cornea correct the nearsightedness that results from the refraction of light; they contain both rod and cone cells, meaning they can see in both dim and bright light, but they have far more rod cells than they do cone cells.

Dolphins do, however, lack short wavelength sensitive visual pigments in their cone cells indicating a more limited capacity for color vision than most mammals.

They also have glands on the eyelids and outer corneal layer that act as protection for the cornea. The olfactory lobes are absent in dolphins, suggesting that they have no sense of smell.

Dolphins are not thought to have a good sense of taste, as their taste buds are atrophied or missing altogether. However, some have preferences between different kinds of fish, indicating some sort of attachment to taste.

Dolphins are often regarded as one of Earth's most intelligent animals. Comparing species' relative intelligence is complicated by differences in sensory apparatus, response modes, and nature of cognition.

Furthermore, the difficulty and expense of experimental work with large aquatic animals has so far prevented some tests and limited sample size and rigor in others.

Compared to many other species, however, dolphin behavior has been studied extensively, both in captivity and in the wild. See cetacean intelligence for more details.

Dolphins are highly social animals, often living in pods of up to a dozen individuals, though pod sizes and structures vary greatly between species and locations.

In places with a high abundance of food, pods can merge temporarily, forming a superpod ; such groupings may exceed 1, dolphins.

Membership in pods is not rigid; interchange is common. Dolphins can, however, establish strong social bonds; they will stay with injured or ill individuals, even helping them to breathe by bringing them to the surface if needed.

The dolphin Moko in New Zealand has been observed guiding a female pygmy sperm whale together with her calf out of shallow water where they had stranded several times.

Dolphins communicate using a variety of clicks, whistle-like sounds and other vocalizations. Dolphins also use nonverbal communication by means of touch and posturing.

Dolphins also display culture, something long believed to be unique to humans and possibly other primate species.

In May , a discovery in Australia found Indo-Pacific bottlenose dolphins Tursiops aduncus teaching their young to use tools. They cover their snouts with sponges to protect them while foraging.

This knowledge is mostly transferred by mothers to daughters, unlike simian primates, where knowledge is generally passed on to both sexes.

Using sponges as mouth protection is a learned behavior. Forms of care-giving between fellows and even for members of different species [64] see Moko dolphin are recorded in various species — such as trying to save weakened fellows [65] or female pilot whales holding up dead calves for long periods.

Dolphins engage in acts of aggression towards each other. The older a male dolphin is, the more likely his body is to be covered with bite scars.

Male dolphins can get into disputes over companions and females. Acts of aggression can become so intense that targeted dolphins sometimes go into exile after losing a fight.

Male bottlenose dolphins have been known to engage in infanticide. Dolphins have also been known to kill porpoises for reasons which are not fully understood, as porpoises generally do not share the same diet as dolphins and are therefore not competitors for food supplies.

Possible explanations include misdirected infanticide, misdirected sexual aggression or play behaviour. Dolphin copulation happens belly to belly; though many species engage in lengthy foreplay , the actual act is usually brief, but may be repeated several times within a short timespan.

Dolphins are known to display non-reproductive sexual behavior , engaging in masturbation , stimulation of the genital area of other individuals using the rostrum or flippers, and homosexual contact.

Various species of dolphin have been known to engage in sexual behavior up to and including copulation with dolphins of other species. Sexual encounters may be violent, with male dolphins sometimes showing aggressive behavior towards both females and other males.

There are various feeding methods among and within species, some apparently exclusive to a single population. Fish and squid are the main food, but the false killer whale and the orca also feed on other marine mammals.

Orcas on occasion also hunt whale species larger than themselves. The orca or killer whale usually carries teeth while the popular bottlenose dolphin has anywhere from conical teeth and its smaller cousin the common dolphin has teeth so that the number of teeth each breed carries varies widely between individuals.

Hybrids between common and bottlenose bred in captivity had an intermediate amount of teeth. One common feeding method is herding, where a pod squeezes a school of fish into a small volume, known as a bait ball.

Individual members then take turns plowing through the ball, feeding on the stunned fish. Reports of cooperative human-dolphin fishing date back to the ancient Roman author and natural philosopher Pliny the Elder.

Here, dolphins drive fish towards fishermen waiting along the shore and signal the men to cast their nets. The dolphins' reward is the fish that escape the nets.

In Shark Bay , Australia, dolphins catch fish by trapping them in huge conch shells. From to , in 5, encounters with dolphins, researchers observed 19 dolphins shelling 42 times.

The behavior spreads mainly within generations, rather than being passed from mother to offspring. Dolphins are capable of making a broad range of sounds using nasal airsacs located just below the blowhole.

Roughly three categories of sounds can be identified: frequency modulated whistles, burst-pulsed sounds and clicks.

Dolphins communicate with whistle-like sounds produced by vibrating connective tissue, similar to the way human vocal cords function, [86] and through burst-pulsed sounds, though the nature and extent of that ability is not known.

The clicks are directional and are for echolocation, often occurring in a short series called a click train.

The click rate increases when approaching an object of interest. Dolphin echolocation clicks are amongst the loudest sounds made by marine animals.

Bottlenose dolphins have been found to have signature whistles, a whistle that is unique to a specific individual. These whistles are used in order for dolphins to communicate with one another by identifying an individual.

It can be seen as the dolphin equivalent of a name for humans. This consists of an experience with other dolphins that modifies the signal structure of an existing whistle sound.

An auditory experience influences the whistle development of each dolphin. Dolphins are able to communicate to one another by addressing another dolphin through mimicking their whistle.

The signature whistle of a male bottlenose dolphin tends to be similar to that of his mother, while the signature whistle of a female bottlenose dolphin tends to be more distinguishing.

The research on other species done so far has yielded varied outcomes and inconclusive results. Because dolphins are generally associated in groups, communication is necessary.

Signal masking is when other similar sounds conspecific sounds interfere with the original acoustic sound. Dolphins tend to travel in pods, upon which there are groups of dolphins that range from a few to many.

Although they are traveling in these pods, the dolphins do not necessarily swim right next to each other. Rather, they swim within the same general vicinity.

In order to prevent losing one of their pod members, there are higher whistle rates. Because their group members were spread out, this was done in order to continue traveling together.

Dolphins frequently leap above the water surface, this being done for various reasons. When travelling, jumping can save the dolphin energy as there is less friction while in the air.

Dolphins show various types of playful behavior, often including objects, self-made bubble rings , other dolphins or other animals.

Playful human interaction with dolphins being the most obvious example, however playful interactions have been observed in the wild with a number of other species as well, such as humpback whales and dogs.

Juvenile dolphins off the coast of Western Australia have been observed chasing, capturing, and chewing on blowfish.

Dolphins are known to teach, learn, cooperate, scheme, and grieve. Brain size was previously considered a major indicator of the intelligence of an animal.

Since most of the brain is used for maintaining bodily functions, greater ratios of brain to body mass may increase the amount of brain mass available for more complex cognitive tasks.

Killer whales have the second largest brain mass of any animal on earth, next to the sperm whale. Self-awareness is seen, by some, to be a sign of highly developed, abstract thinking.

Self-awareness, though not well-defined scientifically, is believed to be the precursor to more advanced processes like meta-cognitive reasoning thinking about thinking that are typical of humans.

Research in this field has suggested that cetaceans, among others, possess self-awareness. If the animal then goes to the mirror in order to view the mark, it has exhibited strong evidence of self-awareness.

Some disagree with these findings, arguing that the results of these tests are open to human interpretation and susceptible to the Clever Hans effect.

This test is much less definitive than when used for primates, because primates can touch the mark or the mirror, while cetaceans cannot, making their alleged self-recognition behavior less certain.

Skeptics argue that behaviors that are said to identify self-awareness resemble existing social behaviors, and so researchers could be misinterpreting self-awareness for social responses to another individual.

The researchers counter-argue that the behaviors shown are evidence of self-awareness, as they are very different from normal responses to another individual.

Whereas apes can merely touch the mark on themselves with their fingers, cetaceans show less definitive behavior of self-awareness; they can only twist and turn themselves to observe the mark.

In , Marten and Psarakos used television to test dolphin self-awareness. They concluded that their evidence suggested self-awareness rather than social behavior.

While this particular study has not been repeated since then, dolphins have since passed the mirror test.

Generally, dolphins sleep with only one brain hemisphere in slow-wave sleep at a time, thus maintaining enough consciousness to breathe and to watch for possible predators and other threats.

Sleep stages earlier in sleep can occur simultaneously in both hemispheres. In this case, respiration is automatic; a tail kick reflex keeps the blowhole above the water if necessary.

Anesthetized dolphins initially show a tail kick reflex. Living in water with strong currents and potentially dangerous floating debris, it must swim continuously to avoid injury.

Dolphins have few marine enemies. Some species or specific populations have none, making them apex predators. For most of the smaller species of dolphins, only a few of the larger sharks, such as the bull shark , dusky shark , tiger shark and great white shark , are a potential risk, especially for calves.

National Marine Mammal Foundation revealed that dolphins, like humans, develop a natural form of type 2 diabetes which may lead to a better understanding of the disease and new treatments for both humans and dolphins.

Dolphins can tolerate and recover from extreme injuries such as shark bites although the exact methods used to achieve this are not known. The healing process is rapid and even very deep wounds do not cause dolphins to hemorrhage to death.

Furthermore, even gaping wounds restore in such a way that the animal's body shape is restored, and infection of such large wounds seems rare.

A study published in the journal Marine Mammal Science suggests that at least some dolphins survive shark attacks using everything from sophisticated combat moves to teaming up against the shark.

Some dolphin species are at risk of extinction, especially some river dolphin species such as the Amazon river dolphin, and the Ganges and Yangtze river dolphin , which are critically or seriously endangered.

A survey found no individuals of the Yangtze river dolphin, which now appears to be functionally extinct.

Pesticides , heavy metals, plastics, and other industrial and agricultural pollutants that do not disintegrate rapidly in the environment concentrate in predators such as dolphins.

Various fishing methods, most notably purse seine fishing for tuna and the use of drift and gill nets , unintentionally kill many dolphins.

Queensland's shark culling program, which has killed roughly 50, sharks since , has also killed thousands of dolphins as bycatch.

Dolphin safe labels attempt to reassure consumers that fish and other marine products have been caught in a dolphin-friendly way.

The dolphins are netted only while fishermen are in pursuit of smaller tuna. Albacore are not netted this way, making albacore the only truly dolphin-safe tuna.

Dolphins and other smaller cetaceans are also hunted in an activity known as dolphin drive hunting.

This is accomplished by driving a pod together with boats and usually into a bay or onto a beach. Their escape is prevented by closing off the route to the ocean with other boats or nets.

Dolphins are hunted this way in several places around the world, including the Solomon Islands , the Faroe Islands , Peru , and Japan, the most well-known practitioner of this method.

By numbers, dolphins are mostly hunted for their meat , though some end up in dolphinariums. Despite the controversial nature of the hunt resulting in international criticism, and the possible health risk that the often polluted meat causes, thousands of dolphins are caught in drive hunts each year.

Dolphins have long played a role in human culture. Dolphins are sometimes used as symbols, for instance in heraldry.

In Greek myths , dolphins were seen invariably as helpers of humankind. Dolphins also seem to have been important to the Minoans , judging by artistic evidence from the ruined palace at Knossos.

During the excavations of a major Mycenaean city at Iklaina , a striking fragment of a wall-paintings came to light, depicting a ship with three human figures and dolphins.

Dolphins are common in Greek mythology , and many coins from ancient Greece have been found which feature a man, a boy or a deity riding on the back of a dolphin.

A dolphin rescued the poet Arion from drowning and carried him safe to land, at Cape Matapan , a promontory forming the southernmost point of the Peloponnesus.

There was a temple to Poseidon and a statue of Arion riding the dolphin. He drowned but was transfigured as the marine deity Palaemon, while his mother became Leucothea.

At Corinth, he was so closely connected with the cult of Poseidon that the Isthmian Games , originally instituted in Poseidon's honor, came to be looked upon as the funeral games of Melicertes.

Phalanthus was another legendary character brought safely to shore in Italy on the back of a dolphin, according to Pausanias.

Dionysus was once captured by Etruscan pirates who mistook him for a wealthy prince they could ransom. After the ship set sail Dionysus invoked his divine powers, causing vines to overgrow the ship where the mast and sails had been.

He turned the oars into serpents, so terrifying the sailors that they jumped overboard, but Dionysus took pity on them and transformed them into dolphins so that they would spend their lives providing help for those in need.

Dolphins were also the messengers of Poseidon and sometimes did errands for him as well. Dolphins were sacred to both Aphrodite and Apollo. When heraldry developed in the Middle Ages , not much was known about the biology of the dolphin and it was often depicted as a sort of fish.

Traditionally, the stylised dolphins in heraldry still may take after this notion, sometimes showing the dolphin skin covered with fish scales.

Dolphins are present in the coat of arms of Anguilla and the coat of arms of Romania , [] and the coat of arms of Barbados has a dolphin supporter.

In Hindu mythology the Ganges river dolphin is associated with Ganga , the deity of the Ganges river. The dolphin is said to be among the creatures which heralded the goddess' descent from the heavens and her mount, the Makara , is sometimes depicted as a dolphin.

The Boto , a species of river dolphin that resides in the Amazon River , are believed to be shapeshifters, or encantados , who are capable of having children with human women.

There are comparatively few surviving myths of dolphins in Polynesian cultures, in spite of their maritime traditions and relevance of other marine animals such as sharks and seabirds ; unlike these, they are more often perceived as food than as totemic symbols.

Dolphins are most clearly represented in Rapa Nui Rongorongo , and in the traditions of the Caroline Islands they are depicted similarly to the Boto, being sexually active shapeshifters.

The renewed popularity of dolphins in the s resulted in the appearance of many dolphinaria around the world, making dolphins accessible to the public.

Criticism and animal welfare laws forced many to close, although hundreds still exist around the world. In the United States, the best known are the SeaWorld marine mammal parks.

Various species of dolphins are kept in captivity. These small cetaceans are more often than not kept in theme parks, such as SeaWorld , commonly known as a dolphinarium.

Bottlenose dolphins are the most common species of dolphin kept in dolphinariums as they are relatively easy to train, have a long lifespan in captivity and have a friendly appearance.

Hundreds if not thousands of bottlenose dolphins live in captivity across the world, though exact numbers are hard to determine.

Other species kept in captivity are spotted dolphins , false killer whales and common dolphins , Commerson's dolphins , as well as rough-toothed dolphins , but all in much lower numbers than the bottlenose dolphin.

There are also fewer than ten pilot whales , Amazon river dolphins , Risso's dolphins , spinner dolphins , or tucuxi in captivity.

The number of killer whales kept in captivity is very small, especially when compared to the number of bottlenose dolphins, with 60 captive killer whales being held in aquaria as of [update].

From to , 55 whales were taken from the wild in Iceland, 19 from Japan, and three from Argentina. These figures exclude animals that died during capture.

Organizations such as the Mote Marine Laboratory rescue and rehabilitate sick, wounded, stranded or orphaned dolphins while others, such as the Whale and Dolphin Conservation and Hong Kong Dolphin Conservation Society , work on dolphin conservation and welfare.

India has declared the dolphin as its national aquatic animal in an attempt to protect the endangered Ganges river dolphin.

The Vikramshila Gangetic Dolphin Sanctuary has been created in the Ganges river for the protection of the animals.

There is debate over the welfare of cetaceans in captivity, and often welfare can vary greatly dependent on the levels of care being provided at a particular facility.

In the United States, facilities are regularly inspected by federal agencies to ensure that a high standard of welfare is maintained. Organizations such as World Animal Protection and the Whale and Dolphin Conservation campaign against the practice of keeping them in captivity.

Captives have vastly reduced life expectancies, on average only living into their 20s, although there are examples of killer whales living longer, including several over 30 years old, and two captive orcas, Corky II and Lolita, are in their mids.

In the wild, females who survive infancy live 46 years on average, and up to 70—80 years in rare cases. Wild males who survive infancy live 31 years on average, and up to 50—60 years.

Critics claim captive life is stressful due to these factors and the requirement to perform circus tricks that are not part of wild killer whale behavior.

Although dolphins generally interact well with humans, some attacks have occurred, most of them resulting in small injuries.

The record-holder of documented orca fatal attacks is a male named Tilikum , [] [] [] who lived at SeaWorld from until his death in There are documented incidents in the wild, too, but none of them fatal.

While dolphin attacks occur far less frequently than attacks by other sea animals, such as sharks , some scientists are worried about the careless programs of human-dolphin interaction.

Andrew J. Read, a biologist at the Duke University Marine Laboratory who studies dolphin attacks, points out that dolphins are large and wild predators, so people should be more careful when they interact with them.

Several scientists who have researched dolphin behaviour have proposed that dolphins' unusually high intelligence in comparison to other animals means that dolphins should be seen as non-human persons who should have their own specific rights and that it is morally unacceptable to keep them captive for entertainment purposes or to kill them either intentionally for consumption or unintentionally as by-catch.

A number of militaries have employed dolphins for various purposes from finding mines to rescuing lost or trapped humans.

The military use of dolphins , however, drew scrutiny during the Vietnam War when rumors circulated that the United States Navy was training dolphins to kill Vietnamese divers.

Dolphins are still being trained by the United States Navy for other tasks as part of the U. Navy Marine Mammal Program. The Russian military is believed to have closed its marine mammal program in the early s.

In the press reported that dolphins trained to kill by the Soviet Navy had been sold to Iran. Dolphins are an increasingly popular choice of animal-assisted therapy for psychological problems and developmental disabilities.

For example, a study found dolphins an effective treatment for mild to moderate depression. For example, it is not known whether dolphins are more effective than common pets.

In some parts of the world, such as Taiji, Japan and the Faroe Islands , dolphins are traditionally considered as food, and are killed in harpoon or drive hunts.

Dolphin meat is dense and such a dark shade of red as to appear black. Fat is located in a layer of blubber between the meat and the skin. When dolphin meat is eaten in Japan, it is often cut into thin strips and eaten raw as sashimi , garnished with onion and either horseradish or grated garlic, much as with sashimi of whale or horse meat basashi.

When cooked, dolphin meat is cut into bite-size cubes and then batter-fried or simmered in a miso sauce with vegetables. Cooked dolphin meat has a flavor very similar to beef liver.

There have been human health concerns associated with the consumption of dolphin meat in Japan after tests showed that dolphin meat contained high levels of mercury.

The Japanese government recommends that children and pregnant women avoid eating dolphin meat on a regular basis. Similar concerns exist with the consumption of dolphin meat in the Faroe Islands , where prenatal exposure to methylmercury and PCBs primarily from the consumption of pilot whale meat has resulted in neuropsychological deficits amongst children.

However, the Faroe Islands populations also eat significant numbers of fish. The study of about Faroese children showed that prenatal exposure to methylmercury resulted in neuropsychological deficits at 7 years of age.

From Wikipedia, the free encyclopedia. Redirected from Dolphins. This article is about the marine mammals. For other uses, see Dolphin disambiguation.

Common dolphin. Bottlenose dolphin. Spotted dolphin. Atlantic spotted dolphin. Commerson's dolphin. Dusky dolphin. Killer whale.

Amazon river dolphin. Main article: Evolution of cetaceans. See also: Cetacean surfacing behaviour. Main article: Cetacean intelligence.

Further information: Sleep non-human. See also: Dolphin drive hunting and Cetacean bycatch. See also: Captive killer whales. Main article: Military dolphin.

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NY: Plenum. Retrieved March 11, Texas Marine Mammal Stranding Network. Archived from the original on February 6, Retrieved November 20, This time around, we had more than enough on our plate to write about, including support in the latest builds for a very interesting game: The Metroid Prime 3's E3 Beta.

But before we get to the new changes, we need to cover something we missed last month. So, without further delay, please enjoy the mostly April Progress Report!

We understand that the past few months have been trying for many of us across the world. Something like this can make what you do feel so very small in the grand scheme of things.

Everyone has their ways of coping with isolation, using the internet, games, emulation, and much more as forms of entertainment to keep spirits up.

To those of you relying on Dolphin Emulator, we hope that Dolphin Emulator makes your day a little brighter in these trying times.

In this Progress Report, you'll find that we've got a lot of changes affecting things outside of core emulation. For instance, Dolphin on Android and macOS see the return of Dark Mode , perfect for late night gaming without straining your eyes.

But if we're going to talk about the main event, we have a new way to use your Wii Remotes that brings tremendous flexibility.

With two months of changes to get through, it's about time we just dived in. Please enjoy the February and March Progress Report! The Last Story. Super Mario Galaxy.

Metroid Prime 3: Corruption. Xenoblade Chronicles.

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