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The name 'dolphin' is used casually as a synonym for bottlenose dolphin, the most common and familiar species of dolphin. In common usage the term 'whale' is used only for the larger cetacean species, while the smaller ones with a beaked or longer nose are considered 'dolphins'.

This term has often been misused in the US, mainly in the fishing industry, where all small cetaceans (dolphins and porpoises) are considered porpoises, while the fish dorado is called dolphin fish. The term 'dolphin' can be used to refer to, under the parvorder Odontoceti, all the species in the family Delphinidae (oceanic dolphins) and the river dolphin families Iniidae (South American river dolphins), Pontoporiidae ( La Plata dolphin), Lipotidae (Yangtze river dolphin) and Platanistidae (Ganges river dolphin and Indus river dolphin). The term mereswine (that is, 'sea pig') has also historically been used. The name was transmitted via the Latin delphinus (the romanization of the later Greek ОґОµО»П†бї–ОЅОїП‚ вЂ“ delphinos ), which in Medieval Latin became dolfinus and in Old French daulphin, which reintroduced the ph into the word 'Dol phin'. The animal's name can therefore be interpreted as meaning 'a 'fish' with a womb'. The name is originally from Greek ОґОµО»П†ОЇП‚ ( delphГs), 'dolphin', which was related to the Greek ОґОµО»П†ПЌП‚ ( delphus), 'womb'. The most common dolphin species in captivity is the bottlenose dolphin, while there are around 60 killer whales in captivity. Dolphins are sometimes kept in captivity and trained to perform tricks.

Dolphin imaging restore x ray file series#

Dolphins occasionally feature in literature and film, as in the film series Free Willy. Dolphins have been depicted in various cultures worldwide. Besides drive hunting, they also face threats from bycatch, habitat loss, and marine pollution. Dolphins produce a variety of vocalizations, usually in the form of clicks and whistles.Дolphins are sometimes hunted in places such as Japan, in an activity known as dolphin drive hunting. Mothers of some species fast and nurse their young for a relatively long period of time. Calves are typically born in the spring and summer months and females bear all the responsibility for raising them. Male dolphins typically mate with multiple females every year, but females only mate every two to three years. Dolphins feed largely on fish and squid, but a few, like the killer whale, feed on large mammals, like seals.

Dolphin imaging restore x ray file skin#

They have a layer of fat, or blubber, under the skin to keep warm in the cold water.ДЄlthough dolphins are widespread, most species of them prefer the warmer waters of the tropic zones, but some, like the right whale dolphin, prefer colder climates. Some species are well adapted for diving to great depths.

They have well-developed hearing which is adapted for both air and water and is so well developed that some can survive even if they are blind. Dolphins use their conical shaped teeth to capture fast-moving prey. Though not quite as flexible as seals, some dolphins can travel at speeds 29 kilometres (18В mi) per hour for short distances. They have streamlined bodies and two limbs that are modified into flippers. Several species of dolphins exhibit sexual dimorphism, in that the males are larger than females. Dolphins can sometimes leap about 30 feet (9.1В m). There are 40 extant species named as dolphins.Дolphins range in size from the relatively small 1.7-metre-long (5В ft 7В in) long and 50-kilogram (110-pound) bodied Maui's dolphin to the 9.5В m (31В ft 2В in) and 10-tonne (11-short-ton) killer whale. The term dolphin usually refers to the extant families Delphinidae (the oceanic dolphins), Platanistidae (the Indian river dolphins), Iniidae (the New World river dolphins), Pontoporiidae (the brackish dolphins), and the extinct Lipotidae (baiji or Chinese river dolphin). For other uses, see Dolphin (disambiguation).Д¬ladistically included but traditionally excluded taxaДolphin is the common name of aquatic mammals within the infraorder Cetacea. This article is about the marine mammals.

Dolphin imaging restore x-ray file