Dolphin

Individual species may employ a number of methods of hunting:. was named after this establishment. There are no known reports of cannibalism amongst dolphins. The London football club Arsenal F.C. The larger species, especially the orca, are capable of eating marine mammals, even large whales. In England the Royal Arsenal (also known as the Woolwich Arsenal), manufactured and stored the requirements of the army and navy. Usually, the prey is swallowed whole. In the manufacturing branches are required skill, and efficient and economical work, both executive and administrative; in the storekeeping part, good arrangement, great care, thorough knowledge of all warlike stores, both in their active and passive state, and scrupulous exactness in the custody, issue and receipt of stores.

Some dolphins may take crustaceans. C: Under the head of administration would be classed the chief director of the arsenal, officials military and civil, non-commissioned officers and military artificers, civilian foremen, workmen and laborers, with the clerks and writers necessary for the office work of the establishments. The dentition is adapted to the animals they hunt: Species with long beaks and many teeth forage on fish, whereas short beaks and lesser tooth count are linked to catching squid. In a second- class arsenal there would be workshops instead of these factories. Dolphins are predators, chasing their prey at high speed. Under B: Gun factory, carriage factory, laboratory, small-arms factory, harness and tent factory, powder factory, etc. Since dolphins spend most of their time below the surface in the wild, just tasting the water could act as a sense of smell. Under A we should have the following departments and stores: Departments of issue and receipt, pattern room, armoury department, ordnance or park, harness, saddlery and accoutrements, camp equipment, tools and instruments, engineer store, timber yard, braking-up store, unserviceable store.

However, they seem to lack a well-developed sense of smell, but they most likely can taste and do show preferences for certain kinds of fish. The usual subdivision of branches in a great arsenal is into A, Storekeeping; B, Construction; C, Administration. The dolphin's sense of touch is also well-developed. The importance of a large arsenal is such that its defences would be on the scale of those of a large fortress. Hearing is also used for echolocation which seems to be an ability all dolphins have. If of the first class, it should be situated at the base of operations and supply, secure from attack, not too near a frontier, and placed so as to draw in readily the resources of the country. Though they have a small ear opening on each side of their head it is believed hearing underwater is also if not exclusively done with the lower jaw which conducts the vibrations to the middle ear via a fat filled cavity in the lower jaw bone. The situation of an arsenal should be governed by strategic considerations.

Most dolphins have acute eyesight both in and out of the water and their sense of hearing is far above our own. In a second-class arsenal the factories would be replaced by workshops. Compare also: whale behavior. A first-class arsenal, which can renew the materiel and equipment of a large army, embraces a gun factory, carriage factory, laboratory and small-arms ammunition factory, small-arms factory, harness, saddlery and tent factories, and a powder factory; in addition it must possess great store-houses. She most likely died of self induced asphyxiation in the presence of her trainer Richard O'Barry.[1]. For the rest of Early Modern Europe, the Arsenal was the Venetian Arsenal. Probably one of the best known cases of dolphin suicide is that of a dolphin named Cathy, one of the bottlenose dolphins that performed in the television series Flipper. of Venice, etc.), have been discounted.

They either do so by repeatedly slamming their head against the pool walls or other solid objects or simply by not coming up for air anymore. Such guesses as arx navalis, naval citadel, arx senatus (i.e. In captivity, many dolphins seem to have committed suicide. The word is of Arabic origin, being a corruption of daras-sina'ah, house of trade or manufacture, dar, house, al, the, and sina'ah, trade, manufacture (with jana'a, to make). The technology to use sponges as mouth protection is not genetically inherited but a taught cultural behaviour. Italian arzanale, Spanish arsenal, etc.; Italian also has arzana and darsena, and Spanish a longer form atarazanal. Other than with primate simians, the knowledge to use a tool is mostly handed over only from mothers to daughters. The word arsenal appears in various forms in Romanic languages (from which it has been adopted into Teutonic), i.e.

The animals break off sponges and put them onto their mouths thus protecting the delicate body part during their hunt for fish on the seabed. An arsenal is an establishment for the construction, repair, receipt, storage and issue of weapons and ammunition. In May 2005, researchers in Australia discovered a cultural aspect of dolphin behaviour: Some dolphins (Tursiops aduncus) teach their offspring to use a tool. Such military dolphins, however, drew scrutiny during the Vietnam War when rumors circulated that dolphins were being trained to kill Vietnamese Skin Divers. The military has employed dolphins for various purposes from finding mines to rescuing lost or trapped persons.

Dolphin/Human interaction is also employed in a curative sense at places where dolphins work with autistic or otherwise disabled children. Dolphins trained to perform in front of an audience have become a favorite attraction in dolphinaria, for example SeaWorld. Because of their high capacity for learning, dolphins have been employed by humans for any number of purposes. This leads to them staying with injured or ill fellows for support.

However, the animals can establish strong bonds between each other. Membership in schools is not rigid; interchange is common. They also use ultrasonic sounds for echolocation. The individuals communicate using a variety of clicks, whistles and other vocalizations.

In places with a high abundance of food, schools can join temporarily, forming an aggregation called a superpod; such groupings may exceed 1000 dolphins. Dolphins are social animals, living in pods (also called "schools") of up to a dozen animals. There are many stories of dolphins protecting shipwrecked sailors against sharks by swimming circles around the swimmers. In return, in some cultures like in Ancient Greece they were treated with welcome; a ship spotting dolphins riding in their wake was considered a good omen for a smooth voyage.

They are also famous for their willingness to occasionally approach humans and playfully interact with them in the water. Frequently dolphins will accompany boats, riding the bow waves. They have even been seen harassing other creatures, like seabirds and turtles. Play is a very important part of dolphins' lives and they can often be observed playing with seaweed or playfighting with other dolphins.

Perhaps they just do it for fun. They could also be communicating to other dolphins to join a hunt, or attempting to dislodge parasites. Scientists aren't quite certain about the purpose of this behavior, but it may be to locate schools of fish by looking at above water signs, like feeding birds. the spinner dolphin).

Dolphins often leap above the water surface, sometimes performing acrobatic figures (e.g. See the Dolphin intelligence article for more details. Straightforward comparisons of species' relative intelligence are complicated by differences in sensory apparatus, response modes, and nature of cognition; furthermore, the difficulty and expense of doing experimental work with a large marine animal mean that even such tests as can meaningfully be done have still not been done, or have been carried out with inadequate sample size and methodology. However, experts in comparative psychology or animal cognition would be reluctant to make any such estimate, as quantitative comparisons of intelligence between species are notoriously difficult to make in principle.

A typical statement would be that dolphins are roughly as intelligent as a two-year-old human. Dolphins are widely believed to be amongst the most intelligent of all animals. See individual species articles for details. It is often combined with lines and patches of different hue and contrast.

The basic coloration patterns are shades of gray with a light underside and a distinct dark cape on the back. The dolphin brain is large and has a highly structured cortex, which often is referred to in discussions about their high intelligence. Teeth can be very numerous (up to 250) in several species. In many species, the jaws are elongated, forming a distinct beak; for some species like the Bottlenose, there is a curved mouth that looks like a fixed smile.

The head contains the melon, a round organ used for echolocation. Dolphins have a fusiform body, adapted for fast swimming. See evolution of cetaceans for the details. They entered the water roughly 50 million years ago.

Modern dolphin skeletons have two small rod shaped pelvic bones thought to be left-over hind legs. Dolphins, along with whales and porpoises, are descendants of land-living mammals, most likely of the Artiodactyl order. See also wolphin. There has also been a reported hybrid between a beluga and a narwhal.

Dall's Porpoises and Harbour Porpoises have hybridized in the wild. Blue Whales, Fin Whales and Humpback Whales all hybridize in the wild. In the wild, bands of males of one dolphin species have been observed to mate with lone female Spinners. In the wild, Spinner Dolphins have sometimes hybridised with Spotted Dolphins and Bottlenose Dolphins.

In captivity, a Bottlenose Dolphin and a Rough-Toothed Dolphin produced hybrid offspring. This mating has since been repeated in captivity and a hybrid calf was born. In 1933, three strange dolphins were beached off the Irish coast; these appeared to be hybrids between Risso's Dolphin and the Bottlenose Dolphin. They are sometimes called "blackfish":.

Six animals in the family Delphinidae are commonly called "whales" but are strictly speaking dolphins. . The family Delphinidae is the largest in the Cetacea, and relatively recent: dolphins evolved about 10 million years ago, during the Miocene. They are found worldwide, mostly in the shallower seas of the continental shelves, and all are carnivores, mostly eating fish and squid.

Most species weigh about 50 to 200 kg (110 to 440 lb). They vary in size from 1.2 m (4 ft) and 40 kg (88 lb) (Maui's Dolphin), up to 9.5 m (30 ft) and 10 tonnes (the Orca). There are almost 40 species of dolphin in 17 genera. Orcas and some related species belong to the Delphinidae family and therefore qualify as dolphins, even though they are called whales in common language.

Porpoises (suborder Odontoceti, family Phocoenidae) are thus not dolphins in our sense. In this article, the second definition is used. It can mean:. The word is used in a few different ways.

"a 'fish' with a womb". The name is from Ancient Greek δελφίς delphis meaning "with a womb", viz. Dolphins are aquatic mammals related to whales and porpoises. In the William Gibson short story Johnny Mnemonic and the film by the same name (starring Keanu Reeves), cyborg dolphins were used in war-time by the military to find submarines and, after the war, by a group of revolutionaries to decode encrypted information.

One of the mates of the ship is named Akeakamai, in honor of the real-life dolphin from Louis Herman's animal language research. In the book Startide Rising by author David Brin, the spaceship Streaker is manned by neo-dolphins (dolphins genetically engineered to match human intelligence). In one scene, the dolphins' misbehavior elicits the following quote from Zissou: "Son of a bitch, I'm sick of these dolphins.". In The Life Aquatic with Steve Zissou, marine researcher Zissou (played by Bill Murray) has trained reconaissance dolphins which apparently are temperamental and rarely follow their instructions.

In seaQuest DSV and seaQuest 2032, Darwin the dolphin could communicate with English speakers using a vocoder, an invention that translated the clicks and whistles to English and back. Mike and the 'Bots then quickly apoligize. While doing so, the SOL gets blasted by a ship that turns out to be piloted by dolphins. In the Mystery Science Theater 3000 episode "Devil Fish," Mike and the 'Bots mock dolphins.

Their logo depicts an aqua-colored bottlenose dolphin wearing an American football helmet and jumping in front of a coral-colored sunburst. An American National Football League (NFL) team is named the Miami Dolphins. A book called 'The Music of Dolphins' was written by Karen Hesse, about a girl who had lived with dolphins since the age of four. Ecco the Dolphin stars in a series of games for the Sega Genesis/Mega Drive, Game Gear, Sega Dreamcast and PlayStation 2.

After study at the Dolphins Plus research center in Key Largo, Florida, fantasy author Ken Grimwood wrote dolphins into his 1995 novel Into the Deep, including entire chapters written from the viewpoint of his dolphin characters. Their story is told in So Long, and Thanks for All the Fish. However, their behavior was misinterpreted as playful acrobatics. In The Hitchhiker's Guide to the Galaxy, dolphins are the most intelligent creatures on Earth and tried in vain to warn humans of the impending destruction of the planet.

The television show was based on a 1963 film, and remade as a feature film in 1996 starring Elijah Wood and Paul Hogan (actor), as well as a television series running from 1995-2000 starring Jessica Alba. The popular television show Flipper, created by Ivan Tors, portrayed a dolphin in a friendly relationship with two boys, Sandy and Bud; a kind of sea going Lassie, Flipper understood English unusually well and was a marked hero: "Go tell Dad we're in trouble, Flipper! Hurry!" The show's theme song contains the lyric no one you see / is smarter than he. Foraging - A recent study reported that wild bottlenose dolphins (Tursiops) in Western Australia use sponges to forage in the sea bed for food.[2]. Stunning - using the echolocation melon, very loud clicks are directed at prey, stunning them.

Fish Wacking - where the dolphin uses its fluke to strike the fish, stunning it and sometimes sending it clear out of the water. Corralling - where fish are chased to shallow water where they are more easily captured. Herding - where a superpod will control a school of fish while individual members take turns plowing through the herd, feeding. Short-finned Pilot Whale, Globicephala macrorhynchus.

Long-finned Pilot Whale, Globicephala melas. False Killer Whale, Psudoorca crassidens. Pygmy Killer Whale, Feresa attenuata. Killer Whale, Orcinus orca.

Melon-headed Whale, Peponocephalia electra. La Plata Dolphin (Franciscana), Pontoporia blainvillei. Genus Pontoporia