The Risso's Dolphin (Grampus griseus) is the only In biology, a species is a kind of organism. Loosely speaking, a species is a related group of organisms that share a more or less distinctive form and are capable of interbreeding. As defined by Ernst Mayr, species are groups of actually or potentially interbreeding natural populations which are reproductively... species of This article is about the dolphin mammal. For other uses of the term, please see dolphin (disambiguation). Genera See article below. Dolphins are certain aquatic mammals related to whales and porpoises. The name is from Ancient Greek δελφίς delphis meaning with a womb, viz. a... dolphin in the See genus (mathematics) for the use of the term in mathematics. See genus (music) for the use of the term in music. In biology, a genus (plural genera) is a grouping in the classification of living organisms having one or more related and morphologically similar species. In the common binomial... genus Grampus.

Taxonomy

Risso's Dolphin was first described by Georges Cuvier Baron Georges Leopold Chretien Frédéric Dagobert Cuvier (August 23, 1769 - May 13, 1832) was a French naturalist, He was born at Montbéliard (then Mömpelgard in Württemberg) under the name of Johann Leopold Nicolaus Friedrich Kuefer, and was the son of a retired officer... Cuvier in 1812. The species' common name is for Mr. Risso who described a specimen to Cuvier on which Cuvier made his first description. Another common name for Risso's Dolphin is the Grampus (also the species genus) - although as a common name was historically used to describe the Binomial name Orcinus orca Linnaeus, 1758 Orca range (in blue) The orca (Orcinus orca), commonly known as the killer whale, and sometimes called the grampus, is the largest member of the oceanic dolphin family. It is the second-most widely distributed mammal on Earth (after humans) and is found in... Orca. The etymology of the word grampus is unclear. It may be an aglomeration of the Latin was the language originally spoken in the region around Rome called Latium. It gained great importance as the formal language of the Roman Empire. All Romance languages are descended from Latin, and many words based on Latin are found in other modern languages such as English. It is said... Latin grandis piscis or French (français, langue française) is one of the most important Romance languages, outnumbered in speakers only by Spanish and Portuguese. In 1999 French was the 11th most spoken language in the world being spoken by about 77 million people (called Francophones) as a mother tongue, and... French grand poisson both meaning big fish. The specific name griseus refers to the mottled (almost scarred) grey colour of the dolphin's body.

Physical description

The most obvious feature of this large (up to 3.8m) dolphin is the large dorsal fin, superficially like that of a young or female Binomial name Orcinus orca Linnaeus, 1758 Orca range (in blue) The orca (Orcinus orca), commonly known as the killer whale, and sometimes called the grampus, is the largest member of the oceanic dolphin family. It is the second-most widely distributed mammal on Earth (after humans) and is found in... Orca. The main body colour is very variable, from dark grey in young animals to almost white in old adults. The underside of this heavily built animal is white. Older animals are usually heavily scarred from confrontations with other Risso's or with Suborders Myopsina Oegopsina Squids are the large, diverse group of marine mollusks, popular as food in cuisines as widely separated as the Japanese and the Italian. In fish markets and restaurants in English-speaking countries, it is often known by the name calamari, from the Italian word for these animals... squid.

The head profile is almost square, somewhat like a Binomial name Physeter macrocephalus Linnaeus, 1758 Sperm Whale range The Sperm Whale (Physeter macrocephalus) is the largest of the toothed whales and is the largest toothed animal in the world. The whale was named after the milky-white substance spermaceti found in its head and originally mistaken for sperm. The... Sperm Whale, and the flippers are long and tapering. It will form moderately sized groups, and will mix with other dolphins, but it is not particularly attracted to ships.

The Risso's Dolphin eats mainly squid and fish.

Risso's Dolphin tend to live in groups of about 10-50. No life history data is available.

Population and distribution

It is found worldwide in temperate and tropical waters, usually in deep waters rather than close to land. As well as the warm watered parts of the Indian, Pacific and Atlantic Oceans, Risso's are found in the -1... Mediterranean and (Red Sea is also the name of a state in Sudan) Conshelf II in the Red Sea (Sudan) The Red Sea (Arabic البحر الأحمر Baḥr al-Aḥmar, al-Baḥru l-’Aḥmar; Hebrew... Red Seas, though are absent from the Black Sea - Wikipedia /**/ @import /skins/monobook/IE50Fixes.css; @import /skins/monobook/IE55Fixes.css; @import /skins/monobook/IE60Fixes.css; /**/ Black Sea From Wikipedia Satellite view of the Black Sea, taken by NASA MODIS Cities of the Black Sea The Black Sea (known as the Euxine Sea in the antiquity) is an... Black Sea. Their preferred environment is just off the The continental shelf is the extended perimeter of each continent, which is covered during interglacial periods such as the one we live in by relatively shallow seas and gulfs. The shelf typically ends at a very steep slope (called the shelf break). The sea bottom below the break is the... continental shelf on steep banks (with water depths varying from 400-1000m) with water temperature at least 10&deg C and preferably in excess of 15&deg C.

The population around the shelf of the United States has been recorded to be in excess of 60,000. In the Pacific a census recorded 175,000 individuals in eastern tropical waters and 85,000 in the west. No global estimate of population exists.

Human interaction

Risso's Dolphins generally do not approach boats. A notable exception was an individual named Pelorus Jack (?-1912?) was a Rissos dolphin famous for following steamers in Cook Strait, New Zealand. Pelorus Jack was first seen around 1888 when he appeared in front of a schooner Brindle when it approached the French Pass. Jack was pale with a white head and there were no... Pelorus Jack who accompanied boats in Admiralty Bay in For alternative meanings, see New Zealand (disambiguation). New Zealand is a country formed of two major islands and a number of Pacific Ocean. A common Māori name for New Zealand is Aotearoa, popularly translated as Land of the Long White Cloud. New Zealand also maintains responsibility for the... New Zealand's Ocean Kayakers on the Marlborough Sounds. The Marlborough Sounds is an extensive network of sea-drowned valleys at the north of the South Island of New Zealand. Geography Covering some 4000 km2 of sounds, islands, and peninsulas, the Marlborough Sounds lie at the South Islands northeasternmost point, between Tasman... Marlborough Sounds for more than 20 years. The crew of the oceanographic research vessel Princesse Alice, of Albert Grimaldi (later Prince Albert I of Monaco) pose while flensing a catch Whaling is the hunting and killing of whales. Historically, poor conservation management by many nations led to far more whales being killed than could be sustained and... Whaling of this species has never been particularly widespread though operations off The Democratic Socialist Republic of Sri Lanka (ශ්රී ලංකා in Sinhala / இலங்கை in Tamil) (known as Ceylon before 1972) is a tropical island nation off the southeast coast of the Indian subcontinent. The island was known in ancient times... Sri Lanka may be significantly damaging the local population. Globally the species is recognised as abundant and safe.

Risso's have been taken into capitivity successfully in the The United States of America — also referred to as the United States, the U.S.A., the U.S., America¹, the States, or (archaically) Columbia — is a federal republic of 50 states located primarily in central North America (with the exception of two states: Alaska and Hawaii... United States and Official language Japanese Capital Tokyo Largest City Tokyo Emperor Akihito Prime Minister Junichiro Koizumi Area  - Total  - % water Ranked 60th 377,835 km² 0.8% Population  - Total ( 2004)  - Density Ranked 10th 127,333,002 337/km² GDP  - Total (PPP, 2005)  - Total (nominal)  ... Japan, though with nowhere near the regularity of Binomial name Tursiops truncatus Montagu, 1821 The Bottlenose Dolphin (Tursiops truncatus) is the most common and well-known dolphin species. It inhabits warm and temperate seas worldwide and may be found in all but the Arctic and the Antarctic Oceans. Physical description Bottlenose Dolphins are grey, varying from dark grey... Bottlenose Dolphins or Binomial name Orcinus orca Linnaeus, 1758 Orca range (in blue) The orca (Orcinus orca), commonly known as the killer whale, and sometimes called the grampus, is the largest member of the oceanic dolphin family. It is the second-most widely distributed mammal on Earth (after humans) and is found in... Orca. This article is about a biological term. See hybrid (disambiguation) for other meanings. In biology, hybrid has two meanings. The first meaning is either the offspring of two different species, or of two different genera. The second meaning of hybrid is crosses between populations or cultivars (cultivated varieties) of a... Hybrid Risso's-Bottlenose Dolphins have been bred in captivity.

References

• National Audobon Society Guide to Marine Mammals of the World ISBN 0375411410
• Encyclopedia of Marine Mammals ISBN 0125513402
• Whales, Dolphins and Porpoises, Mark Carwardine, ISBN 0751327816