dorsal英文

dolphinDolphins are marine mammals that are closely related to whales and porpoises. There are almost forty species of dolphin in seventeen genera. They vary in size from 1.2 metres (4 ft) and 40 kilograms (88 lb) (Maui's Dolphin), up to 9.5 m (30 ft) and ten tonnes (the Orca or Killer Whale). They are found worldwide, mostly in the shallower seas of the continental shelves, and are carnivores, mostly eating fish and squid. The family Delphinidae is the largest in the Cetacea, and relatively recent: dolphins evolved about ten million years ago, during the Miocene. Dolphins are considered to be amongst the most intelligent of animals and their often friendly appearance and seemingly playful attitude have made them popular in human culture

腹鳍 pelvic fin 或者ventral fin尾鳍tail fin背鳍 dorsal fin是从金山词霸的简明英汉词典查的，希望可以有帮助阿！

Humpback WhaleThe Humpback Whale (Megaptera novaeangliae) is a baleen whale. One of the larger rorqual species, adults range in length from 12–16 metres (40–50 ft) and weigh approximately 36,000 kilograms (79,000 lb). The Humpback has a distinctive body shape, with unusually long pectoral fins and a knobbly head. It is an acrobatic animal, often breaching and slapping the water. Males produce a complex whale song, which lasts for 10 to 20 minutes and is repeated for hours at a time. The purpose of the song is not yet clear, although it appears to have a role in mating.Found in oceans and seas around the world, Humpback Whales typically migrate up to 25,000 kilometres each year. Humpbacks feed only in summer, in polar waters, and migrate to tropical or sub-tropical waters to breed and give birth in the winter. During the winter, Humpbacks fast and live off their fat reserves. The species' diet consists mostly of krill and small fish. Humpbacks have a diverse repertoire of feeding methods, including the spectacular bubble net fishing technique.Like other large whales, the Humpback was and is a target for the whaling industry. Due to over-hunting its population fell by an estimated 90% before a whaling moratorium was introduced in 1966. Stocks of the species have since partially recovered, however entanglement in fishing gear, collisions with ships, and noise pollution also remain concerns. There are at least 70,000 humpback whales worldwide. Once hunted to the brink of extinction, Humpbacks are now sought out by whale-watchers, particularly off parts of Australia and the United States. On November 18, 2007 a Japanese fleet set off for the first time in decades to hunt the humpback in the South Pacific[2].Humpback Whales are rorquals (family Balaenopteridae), a family that includes the Blue Whale, the Fin Whale, the Bryde's Whale, the Sei Whale and the Minke Whale. The rorquals are believed to have diverged from the other families of the suborder Mysticeti as long ago as the middle Miocene.[3] However, it is not known when the members of these families diverged from each other.Though clearly related to the giant whales of the genus Balaenoptera, the Humpback has been the sole member of its genus since Gray's work in 1846. More recently though, DNA sequencing analysis has indicated both the Humpback and the Gray Whale are close relatives of the Blue Whale, the world's largest animal. If further research confirms these relationships, it will be necessary to reclassify the rorquals.The Humpback Whale was first identified as "baleine de la Nouvelle Angleterre" by Mathurin Jacques Brisson in his Regnum Animale of 1756. In 1781, Georg Heinrich Borowski described the species, converting Brisson's name to its Latin equivalent, Balaena novaeangliae. Early in the 19th century Lacépède shifted the Humpback from the Balaenidae family, renaming it Balaenoptera jubartes. In 1846, John Edward Gray created the genus Megaptera, classifying the Humpback as Megaptera longpinna, but in 1932, Remington Kellogg reverted the species names to use Borowski's novaeangliae.[4] The common name is derived from their humping motion while swimming. The generic name Megaptera from the Greek mega-/μεγα- "giant" and ptera/πτερα "wing",[5] refers to their large front flippers. The specific name means "New Englander" and was probably given by Brisson due the regular sightings of Humpbacks off the coast of New England.[4]Humpback Whales can easily be identified by their stocky bodies with obvious humps and black dorsal colouring. The head and lower jaw are covered with knobs called tubercles, which are actually hair follicles and are characteristic of the species. The tail flukes, which are lifted high in the dive sequence, have wavy rear edges.[6]The long black and white tail fin, which can be up to a third of body length, and the pectoral fins have unique patterns, which enable individual whales to be recognised.[7][8] Several suggestions have been made to explain the evolution of the Humpback's pectoral fins, which are proportionally the longest fins of any cetacean. The two most enduring hypotheses are the higher maneuverability afforded by long fins, or that the increased surface area is useful for temperature control when migrating between warm and cold climates.Humpbacks have 270 to 400 darkly coloured baleen plates on each side of the mouth. Ventral grooves run from the lower jaw to the umbilicus about halfway along the bottom of the whale. These grooves are less numerous (usually 16–20) and consequently more prominent than in other rorquals. The stubby dorsal fin is visible soon after the blow when the whale surfaces, but has disappeared by the time the flukes emerge. Humpbacks have a distinctive 3 m (10 ft) bushy blow.Newborn calves are roughly the length of their mother's head. A 50' mother would have a 20' newborn weighing in at 2 tons! They are nursed by their mothers for approximately six months, then are sustained through a mixture of nursing and independent feeding for possibly six months more. Some calves have been observed alone after arrival in Alaskan waters. Females reach sexual maturity at the age of five with full adult size being achieved a little later. According to new research, males reach sexual maturity at approximately 7 years of age. Fully grown the males average 15–16 m (49–52 ft), the females being slightly larger at 16–17 m (52–56 ft), with a weight of 40,000 kg (or 44 tons); the largest recorded specimen was 19 m (62 ft) long and had pectoral fins measuring 6 m (20 ft) each.[9] The largest Humpback on record, according to whaling records, was killed in the Caribbean. She was 88 feet long, weighing nearly 90 tons!Females have a hemispherical lobe about 15 centimetres (6 in) in diameter in their genital region. This allows males and females to be distinguished if the underside of the whale can be seen, even though the male's penis usually remains unseen in the genital slit. Male whales have distinctive scars on heads and bodies, some resulting from battles over females.Females typically breed every two or three years. The gestation period is 11.5 months, yet some individuals can breed in two consecutive years. Humpback Whales were thought to live 50 - 60 years, but new studies using the changes in amino acids behind eye lenses proved another baleen whale, the Bowhead, to be 211 years old. This was an animal taken by the Inuit off Alaska. More studies on ages are currently being done.The varying patterns on the Humpback's tail flukes are sufficient to identify an individual. Unique visual identification is not possible in most cetacean species (exceptions include Orcas and Right Whales), so the Humpback has become one of the most-studied species. A study using data from 1973 to 1998 on whales in the North Atlantic gave researchers detailed information on gestation times, growth rates, and calving periods, as well as allowing more accurate population predictions by simulating the mark-release-recapture technique. A photographic catalogue of all known whales in the North Atlantic was developed over this period and is currently maintained by Wheelock College.[10] Similar photographic identification projects have subsequently begun in the North Pacific by SPLASH (Structure of Populations, Levels of Abundance and Status of Humpbacks), and around the world.Social structure and courtship：Humpbacks frequently breach, throwing two thirds or more of their body out of the water and splashing down on their back.Humpbacks frequently breach, throwing two thirds or more of their body out of the water and splashing down on their back.The Humpback social structure is loose-knit. Usually, individuals live alone or in small transient groups that assemble and break up over the course of a few hours. Groups may stay together a little longer in summer in order to forage and feed cooperatively. Longer-term relationships between pairs or small groups, lasting months or even years, have been observed, but are rare. Recent studies extrapolate feeding bonds observed with many females in Alaskan waters over the last 10 years. It is possible some females may have these bonds for a lifetime. More studies need to be done on this. The range of the Humpback overlaps considerably with many other whale and dolphin species — whilst it may be seen near other species (for instance, the Minke Whale), it rarely interacts socially with them. Humpback calves have been observed in Hawaiian waters playing with bottlenose dolphin calves.Courtship rituals take place during the winter months, when the whales migrate towards the equator from their summer feeding grounds closer to the poles. Competition for a mate is usually fierce, and female whales as well as mother-calf dyads are frequently trailed by unrelated male whales dubbed escorts by researcher Louis Herman. Groups of two to twenty males typically gather around a single female and exhibit a variety of behaviours in order to establish dominance in what is known as a competitive pod. The displays may last several hours, the group size may ebb and flow as unsuccessful males retreat and others arrive to try their luck. Techniques used include breaching, spy-hopping, lob-tailing, tail-slapping, flipper-slapping, charging and parrying. "Super pods" have been observed numbering more than 40 males, all vying for the same female. (M. Ferrari et. al)Whale song is assumed to have an important role in mate selection; however, scientists remain unsure whether the song is used between males in order to establish identity and dominance, between a male and a female as a mating call, or a mixture of the two. All these vocal and physical techniques have also been observed while not in the presence of potential mates. This indicates that they are probably important as a more general communication tool. Recent studies showed singing males attract other males. Scientists are extrapolating possibilities the singing may be a way to keep the migrating populations connected. (Ferrari, Nicklin, Darling, et. al.) Studies on this are ongoing.Feeding：A group of 15 whales bubble net fishing near Juneau, AlaskaA group of 15 whales bubble net fishing near Juneau, AlaskaThe species feeds only in summer and lives off fat reserves during winter. Humpback Whales will only feed rarely and opportunistically while in their wintering waters. It is an energetic feeder, taking krill and small schooling fish, such as herring (Clupea harengus), salmon, capelin (Mallotus villosus) and sand lance (Ammodytes americanus) as well as Mackerel (Scomber scombrus), pollock (Pollachius virens) and haddock (Melanogrammus aeglefinus) in the North Atlantic.[11][12][13] Krill and Copepods have been recorded from Australian and Antarctic waters.[14] It hunts fish by direct attack or by stunning them by hitting the water with its flippers or flukes.A pair of Humpback Whales feeding by lunging.A pair of Humpback Whales feeding by lunging.The Humpback has the most diverse repertoire of feeding methods of all baleen whales.[15] Its most inventive technique is known as bubble net fishing: a group of whales blows bubbles while swimming in circles to create a ring of bubbles. The ring encircles the fish, which are confined in an ever-tighter area as the whales swim in a smaller and smaller circles. The whales then suddenly swim upwards through the bubble net, mouths agape, swallowing thousands of fish in one gulp. This technique can involve a ring of bubbles up to 30 m (100 ft) in diameter and the cooperation of a dozen animals. Some of the whales take the task of blowing the bubbles through their blowholes, some dive deeper to drive fish towards the surface, and others herd fish into the net by vocalizing. It is one of the more spectacular acts of collaboration among marine mammals.[16]Humpback Whales are preyed upon by Orcas. The result of these attacks is generally nothing more serious than some scarring of the skin, but it is likely that young calves are sometimes killed.[17]Song：Both male and female Humpback Whales can produce sounds, however only the males produce the long, loud, complex "songs" for which the species is famous. Each song consists of several sounds in a low register that vary in amplitude and frequency, and typically lasts from 10 to 20 minutes.[18] Songs may be repeated continuously for several hours; Humpback Whales have been observed to sing continuously for more than 24 hours at a time. As cetaceans have no vocal cords, whales generate their song by forcing air through their massive nasal cavities.Whales within an area sing the same song, for example all of the Humpback Whales of the North Atlantic sing the same song, and those of the North Pacific sing a different song. Each population's song changes slowly over a period of years —never returning to the same sequence of notes.[18]Scientists are still unsure of the purpose of whale song. Only male Humpbacks sing, so it was initially assumed that the purpose of the songs was to attract females. However, many of the whales observed to approach singing whales have been other males, with the meeting resulting in a conflict. Thus, one interpretation is that the whale songs serve as a threat to other males.[19] Some scientists have hypothesized that the song may serve an echolocative function.[20] During the feeding season, Humpback Whales make altogether different vocalizations, which they use to herd fish into their bubble nets.[21]Population and distribution：The Humpback whale is found in all the major oceans, in a wide band running from the Antarctic ice edge to 65° N latitude, though is not found in the eastern Mediterranean, the Baltic Sea or the Arctic Ocean. There are at least over 70,000 humpback whales worldwide, with 10,000-25,000 in the North Pacific, nearly 12,000 in the North Atlantic, and over 50,000 in the Southern Hemisphere, down from a pre-whaling population of 125,000[citation needed].The Humpback is a migratory species, spending its summers in cooler, high-latitude waters, but mating and calving in tropical and sub-tropical waters.[18] An exception to this rule is a population in the Arabian Sea, which remains in these tropical waters year-round.[18] Annual migrations of up to 25,000 kilometres (16,000 statute miles) are typical, making it one of the farthest-travelling of any mammalian species.A 2007 study identified seven individual whales wintering off the Pacific coast of Costa Rica as those which had made a trip from the Antarctic of around 8,300 km. Identified by their unique tail patterns, these animals have made the longest documented migration by a mammal.[22]In Australia, two main migratory populations have been identified, off the west and east coast respectively. These two populations are distinct with only a few females in each generation crossing between the two groups.[23]Whaling：One of the first attempts to hunt the humpback whale was made by John Smith in 1614 off the coast of Maine. Opportunistic killing of the species is likely to have occurred long before, and it continued with increasing pace in the following centuries. By the 18th century, the commercial value of Humpback Whales had been recognized[citation needed], and they became a common target for whalers for many years.By the 19th century, many nations (and the United States in particular), were hunting the animal heavily in the Atlantic Ocean — and to a lesser extent in the Indian and Pacific Oceans. However, it was the introduction of the explosive harpoon in the late 19th century that allowed whalers to accelerate their take. This, coupled with the opening-up of the Antarctic seas in 1904, led to a sharp decline in all whale populations.It is estimated that during the 20th century at least 200,000 Humpbacks were taken, reducing the global population by over 90%, with the population in the North Atlantic estimated to have dropped to as low as 700 individuals.[24] To prevent species extinction, a general moratorium on the hunting of Humpbacks was introduced in 1966 and is still in force today. In his book Humpback Whales (1996), Phil Clapham, a scientist at the Smithsonian Institute, said "This wanton destruction of some of the earth's most magnificent creatures [is] one of the greatest of our many environmental crimes."By the time the International Whaling Commission (IWC) members agreed on a moratorium on Humpback hunting in 1966, the whales were so scarce that commercial hunting was no longer worthwhile. At this time, 250,000 were recorded killed. However, the true toll is likely to be significantly higher. It is now known that the Soviet Union was deliberately under-recording its kills; the total Soviet Humpback kill was reported at 2,820 whereas the true number is now believed to be over 48,000.[25]As of 2004, hunting of Humpback Whales is restricted to a few animals each year off the Caribbean island Bequia in the nation of St. Vincent and the Grenadines.[15] The take is not believed to threaten the local population.Conservation:Internationally this species is considered vulnerable. Most monitored stocks of Humpback Whales have rebounded well since the end of the commercial whaling era,[1] such as the North Atlantic where stocks are now believed to be approaching pre-hunting levels.[29] However, the species is considered endangered in some countries where local populations have recovered slowly, including the United States.[30]Today, individuals are vulnerable to collisions with ships, entanglement in fishing gear, and noise pollution.[1] Like other cetaceans, Humpbacks are sensitive to noise and can even be injured by it. In the 19th century, two Humpback Whales were found dead near sites of repeated oceanic sub-bottom blasting, with traumatic injuries and fractures in the ears.[31]The ingestion of saxitoxin, a PSP (paralytic shellfish poison) from contaminated mackerel has been implicated in Humpback Whale deaths.[32]Some countries are creating action plans to protect the Humpback; for example, in the United Kingdom, the Humpback Whale has been designated as a priority species under the national Biodiversity Action Plan, generating a set of actions to conserve the species. The sanctuary provided by National Parks such as Glacier Bay National Park and Preserve and Cape Hatteras National Seashore, among others, have also become a major factor in sustaining the populations of the species in those areas.[33]Although much was known about the Humpback Whale due to information obtained through whaling, the migratory patterns and social interactions of the species were not well known until two separate studies by R. Chittleborough and W. H. Dawbin in the 1960s.[34] Roger Payne and Scott McVay made further studies of the species in 1971.[35] Their analysis of whale song led to worldwide media interest in the species, and left an impression in the public mind that whales were a highly intelligent cetacean species, a contributing factor to the anti-whaling stance of many countries.

鲨鱼的英文为Shark例句如下1.Thesharkwaswrithingaroundwildly,tryingtogetfree.鲨鱼拼命挣扎，试图逃脱。2.Thesharkdiveddownandswamundertheboat.鲨鱼急速潜入水中，在船下游动。3.ashark'sdorsalfin鲨鱼的背鳍

腹鳍 fins尾鳍，tail背鳍 dorsal fin

网上很好搜索的，你可以根据关键词humpback whale来搜索，下面我稍微的列出一些：GENERAL DESCRIPTIONThe humpback whale is a baleen whale and a rorqual whale that sings amazing songs. It performs complex and cooperative feeding techniques. The humpback has a bulky head with bumpy protuberances (tubercles), each with a bristle. Humpbacks are acrobats of the ocean, breaching and slapping the water. They live in pods and have 2 blowholes. The name humpback describes the motion it makes as it arches its back out of the water in preparation for a dive. SIZEHumpback whales grow to be about 52 feet (16 m) long, weighing 30-50 tons (27-45 tonnes). The females are slightly larger than males, as with all baleen whales. The four-chambered heart of the average humpback whale weighs about 430 pounds (195 kg) - about as much as three average adult human beings. ……详细参见：