Narwhal

  

The Life of Animals | Narwhal | Narwhal (monodon monoceros) is the name of one of the most whales are not known to man. The name "narwhal" is derived from the Old Norse language which means "corpse whale". Narwhal is a toothed whale-consuming and includes carnivorous marine animals such as fish, shrimp, or squid The mysterious spiral narwhal horn was functioning as a giant sensor to help determine the quality of water and to "smell" other narwhal. towel narwhal whales that could reach 2.4 meters in length it has long been a puzzle the naturalist and hunter. Martin Nweeia, a researcher at Harvard School of Dental Medicine.

According Nweeia, the horn seems to have a hydrodynamic sensing capabilities. Narwhal (monodon monoceros) is a type of whale, including very rare.  Nweeia team discovered that the narwhal horn similar to the membrane with a surface that is very sensitive.

Each whale narwhal (monodon monoceros) also use sound to communicate with each other like dolphins or other whales. Scientists have long known that marine mammals use sound signals to communicate with each other in the water. Recent research even suggests that the whales have dialects.

However, not much research to learn the identity of sounds like a narwhal whales. The researchers believe the narwhal whales use sound to identify each other and differ from one individual to individual. It is the scientists concluded after studying the sounds of three tails narwhal in Admiralty Bay on Baffin Island, Canada. They use electronic recorders attached to the body of the giant mammals. What do narwhal whales like bottle nose dolphins that also whistling noises to communicate. So with different voices, each one can distinguish the individual in the group or other groups.

Blue Whale

 

  

The Life of Animals | Blue Whale | The blue whale (Balaenoptera musculus) is a marine mammal belonging to the suborder of baleen whales (called Mysticeti) At 30 metres (98 ft)  in length and 180 metric tons (200 short tons) or more in weight, it is the largest known animal to have ever existed Long and slender, the blue whale's body can be various shades of bluish-grey dorsally and somewhat lighter underneath There are at least three distinct subspecies: B. m. musculus of the North Atlantic and North Pacific, B. m. intermedia of the Southern Ocean and B. m. brevicauda (also known as the pygmy blue whale) found in the Indian Ocean and South Pacific Ocean. As with other baleen whales, its diet consists almost exclusively of small crustaceans known as krill

Blue whales were abundant in nearly all the oceans on Earth until the beginning of the twentieth century. A 2002 report estimated there were 5,000 to 12,000 blue whales worldwide located in at least five groups. More recent research into the Pygmy subspecies suggests this may be an underestimate Before whaling, the largest population was in the Antarctic, numbering approximately 239,000 (range 202,000 to 311,000) There remain only much smaller (around 2,000) concentrations in each of the North-East Pacific, Antarctic, and Indian Ocean groups. Blue whales are rorquals (family Balaenopteridae), a family that includes the humpback whale, the fin whale, Bryde's whale, the sei whale and the minke whale The family Balaenopteridae is believed to have diverged from the other families of the suborder Mysticeti as long ago as the middle Oligocene.

 

DNA sequencing analysis indicates that the blue whale is phylogenetically closer to the sei whale (Balaenoptera borealis) and Bryde's whale (Balaenoptera brydei) than to other Balaenoptera species, and closer to the humpback whale (Megaptera) and the gray whale (Eschrichtius) than to the minke whales (Balaenoptera acutorostrata and Balaenoptera bonaerensis). Researchers working off of Fiji believe they photographed a hybrid humpback/blue whaleThe first published description of the blue whale comes from Robert Sibbald's Phalainologia Nova (1694). In September 1692, Sibbald found a blue whale that had stranded in the Firth of Forth—a male 78-feet-long—which had "black, horny plates" and "two large apertures approaching a pyramid in shape

Other common names for the blue whale have included Sibbald's rorqual (after Sibbald, who first described the species), the great blue whale and the great northern rorqual. Authorities classify the species into three or four subspecies: B. m. musculus, the northern blue whale consisting of the North Atlantic and North Pacific populations, B. m. intermedia, the southern blue whale of the Southern Ocean, B. m. brevicauda, the pygmy blue whale found in the Indian Ocean and South Pacific and the more problematic B. m. indica, the great Indian rorqual, which is also found in the Indian Ocean and, although described earlier, may be the same subspecies as B. m. brevicauda.When surfacing to breathe, the blue whale raises its shoulder and blowhole out of the water to a greater extent than other large whales, such as the fin or sei whales. Some blue whales in the North Atlantic and North Pacific raise their tail fluke when diving. When reathing, the whale emits a spectacular vertical single-column spout up to 12 metres (39 ft), typically 9 metres (30 ft). Blue whales have twin blowholes shielded by a large splashguard

The whale's upper parts, and sometimes the flippers, are usually mottled. substantially from individual to individual. Blue whales can reach speeds of 50 kilometres per hour (31 mph) over short bursts, usually when interacting with other whales, but 20 kilometres per hour (12 mph) is a more typical traveling speed When feeding, they slow down to 5 kilometres per hour (3.1 mph). Blue whales most commonly live alone or with one other individual. In locations where there is a high concentration of food, as many as 50 blue whales have been seen scattered over a small area. Blue whales are difficult to weigh because of their size. Most blue whales killed by whalers were not weighed whole, but cut up into manageable pieces first. The largest blue whale accurately weighed by NMML scientists to date was a female that weighed 177 metric tons (195 short tons) The heaviest whale ever recorded weighed in at 190 metric tons (210 short tons) while the longest whale ever recorded was 33.3 metres (109 ft).

The blue whale is the largest animal ever known to have lived The largest known dinosaur of the Mesozoic Era was the Argentinosaurus, which is estimated to have weighed up to 90 metric tons (99 short tons), though a controversial vertebra of Amphicoelias fragillimus may indicate an animal of up to 122 metric tons (134 short tons) and 40–60 metres (130–200 ft). There is some uncertainty about the biggest blue whale ever found, as most data come from blue whales killed in Antarctic waters during the first half of the twentieth century, and was collected by whalers not well-versed in standard zoological measurement techniques. The longest whales ever recorded were two females measuring 33.6 metres (110 ft) and 33.3 metres (109 ft).The longest whale measured by scientists at the NMML was 29.9 metres (98 ft)

A blue whale's tongue weighs around 2.7 metric tons (3.0 short tons) and, when fully expanded, its mouth is large enough to hold up to 90 metric tons (99 short tons) of food and water. Despite the size of its mouth, the dimensions of its throat are such that a blue whale cannot swallow an object wider than a beach ball Its heart weighs 600 kilograms (1,300 lb) and is the largest known Blue whale calves gain weight quickly, as much as 90 kilograms (200 lb) every 24 hours. Blue whales are not easy to catch or kill. Soon, blue whales were being hunted in Iceland (1883), the Faroe Islands (1894), Newfoundland (1898), and Spitsbergen (1903). In 1904-05 the first blue whales were taken off South Georgia. By 1925, with the advent of the stern slipway in factory ships and the use of steam-driven whale catchers, the catch of blue whales, and baleen whales as a whole, in the Antarctic and sub-Antarctic began to increase dramatically. In the 1930–31 season, these ships caught 29,400 blue whales in the Antarctic alone. Blue whale hunting was banned in 1966 by the International Whaling Commission, and illegal whaling by the USSR finally halted in the 1970s by which time 330,000 blue whales had been caught in the Antarctic, 33,000 in the rest of the Southern Hemisphere, 8,200 in the North Pacific, and 7,000 in the North Atlantic. Since the introduction of the whaling ban, studies have failed to ascertain whether the conservation reliant global blue whale population is increasing or remaining stable. The IUCN Red List counts the blue whale as "endangered" as it has since the list's inception. 

This group is estimated to total about 500. Beyond Iceland, blue whales have been spotted as far north as Spitsbergen and Jan Mayen, though such sightings are rare. Scientists do not know where these whales spend their winters. The total North Atlantic population is estimated to be between 600 and 1,500.In the Southern Hemisphere, there appear to be two distinct subspecies, B. m. intermedia, the Antarctic blue whale, and the little-studied pygmy blue whale, B. m. brevicauda, found in Indian Ocean waters. The most recent surveys (midpoint 1998) provided an estimate of 2,280 blue whales in the Antarctic of which fewer than 1% are likely to be pygmy blue whales Estimates from a 1996 survey were that 424 pygmy blue whales were in a small area south of Madagascar alone thus it is likely that numbers in the entire Indian Ocean are in the thousands. For example, pygmy blue whales have been recorded in the northern Indian Ocean (Oman, Maldives and Sri Lanka), where they may form a distinct resident population In addition, the population of blue whales occurring off Chile and Peru may also be a distinct population. Efforts to calculate the blue whale population more accurately are supported by marine mammologists at Duke University, who maintain the Ocean Biogeographic Information System—Spatial Ecological Analysis of Megavertebrate Populations (OBIS-SEAMAP), a collation of marine mammal sighting data from around 130 sources.

 

North Atlantic Right Whale

 

The Life of Animals | North Atlantic Right Whale | The North Atlantic right whale (Eubalaena glacialis) which means "good, or true, whale of the ice") is a baleen whale, one of three right whale species belonging to the genus Eubalaena formerly classified as a single species. With only 400 in existence, North Atlantic right whales are among the most endangered whales in the world.

 

About four hundred right whales live in the North Atlantic Ocean. Like other right whales, the North Atlantic right whale is readily distinguished from other whales by the callosities on its head, a broad back without a dorsal fin, and a long arching mouth that begins above the eye. The right whale's callosities appear white due to large colonies of cyamids or whale lice. Adult right whales average 45–55 feet (14–17 m) in length and weigh up to seventy tons (63,500 kg); the largest measured specimens have been 60 feet (18 m) long and 117 tonnes (115 long tons; 129 short tons). Forty percent of a right whale's body weight is blubber, which is of relatively low density. Consequently, unlike many other species of whale, dead right whales float.

Right whales were so-named because whalers thought they were the "right" whale to hunt. As the "right" whale continued to float long after being killed, which made it possible to 'flech' or strip the whale of blubber without having to take it onboard ship. Shore whaling continued sporadically into the 19th century. By 1750, the North Atlantic right whale population was, for commercial purposes, depleted. The population was so low by the mid-19th century that the famous Whitby whaler Rev. William Scoresby, son of the successful British whaler William Scoresby senior (1760-1829), claimed to have never seen a right whale

As it became clear that hunting right whales was unsustainable, international protection for right whales came into effect, as the practice was banned globally in 1937. Madeira took its last two right whales in 1968.For the period of 1970 to October 2006, humans have been responsible for 48% of the 73 documented mortalities of the North Atlantic right whale A 2001 forecast showed a declining population trend in the late 1990s, and indicated a high probability that North Atlantic Right Whales would go extinct within 200 years if the then-existing anthropogenic mortality rate was not curtailed The combined factors of small population size and low annual reproductive rate of right whales means that a single death represents a significant mortality rate. It was calculated that preventing the deaths of just two females per year would enable the population to stabilize The data suggests, therefore, that human sources of mortality may have a greater effect relative to population growth rates of North Atlantic right whales than for other whales.

 

According to a census of individual whales identified using photo-identification techniques, the latest available stock assessment data (December 2010) indicates that a minimum of 361 recognized individuals were known to be alive in 2005 Up to four hundred North Atlantic right whales are thus thought to exist at present, almost all living in the western North Atlantic Ocean. Particularly popular feeding areas are the Bay of Fundy, the Gulf of Maine and Cape Cod Bay. It was later revealed that this animal, which was named as "Pico", is a female from the western Atlantic group Right whales have rarely been observed in the Mediterranean Sea, near Italy and Portugal The Norway sightings appear to be of strays from the western Atlantic stock In 2009, right whales appeared in waters around Greenland  although their origin was not confirmed Prior to this, no right whales had been killed or confirmed present off the coast of Greenland for around two hundred years. In early 2009, scientists recorded a record number of births among the western North Atlantic population. 39 new calves were recorded, born off the Atlantic coast of Florida and Georgia."Right whales, for the first time in a long time, are doing their part: they're having the babies; they're having record numbers of babies," said Monica Zani, an assistant scientist at the New England Aquarium who works with right whales.

 

Bowhead Whale

 

The Life of Animals | Bowhead Whale | The bowhead whale (Balaena mysticetus) is a baleen whale of the right whale family Balaenidae in suborder Mysticeti. This thick-bodied species can weigh 75 tonnes (74 long tons; 83 short tons) to 100 tonnes (98 long tons; 110 short tons)  second only to the blue whale, although the bowhead's maximum length is less than several other whales. It lives entirely in fertile Arctic and sub-Arctic waters, unlike other whales that migrate to feed or reproduce. It is also known as Greenland right whale or Arctic whale. The bowhead is perhaps the longest-living mammal, and has the largest mouth of any animal

The bowhead was an early whaling target. The population is estimated to be over 24,900 worldwide, down from an estimated 50,000 before whaling.The bowhead whale currently occupies a monotypic genus, separate from the other right whales, as it has done since the work of Gray in 1821. It is thought Balaena prisca, one of the five Balaena fossils from the late Miocene (~10 mya) to early Pleistocene (~1.5 mya), may be the same as the modern bowhead whale. The bowhead whale has a robust, dark-colored body, no dorsal fin and a strongly bowed lower jaw and narrow upper jaw. Its baleen, the longest of any whale at 3 m (9.8 ft), strains tiny prey from the water. The bowhead whale is highly vocal, and uses underwater sounds to communicate while traveling, feeding, and socializing. Some bowheads make long repetitive songs that may be mating calls. Observations of very large animals without calves support this hypothesis. The bowhead population around Alaska has increased since commercial whaling ceased. This level of killing (25–40 animals annually) is not expected to affect the population's recovery. In March, 2008, Canada's Department of Fisheries and Oceans stated that previous estimates in the Eastern Arctic had undercounted, with a new estimate of 14,400 animals (r. 4,800–43,000) These larger numbers correspond to pre-whaling estimates, indicating this population has fully recovered.

 

The bowhead whale is the only baleen whale that spends its entire life in and around Arctic waters. The Alaskan population spends the winter months in the southwestern Bering Sea. The bowhead whale has been hunted for blubber, meat, oil, bones, and baleen. Like right whales, it swims slowly, and floats after death, making it ideal for whaling. Before commercial whaling, there were an estimated 50,000 bowheads In 1611, the first whaling expedition sailed to Spitsbergen. By mid-century, the population(s) there had practically been wiped out, forcing whalers to voyage into the "West Ice"—the pack ice off Greenland's east coast. In the North Pacific, commercial bowhead whaling began in the 1840s, and within two decades wiped out over 60 percent of the bowheads.

Humpback whale

 

  
The Life of Animals | Humpback Whale | The humpback whale (Megaptera novaeangliae) is a species of baleen whale. One of the larger rorquals species, adults range in length from 12-16 meters (39-52 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. Found in Oceans and seas around the world, humpback whales typically migrate up to 25.000 kilometres (16.000 mi) 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.

Humpbacks have a diverse repertoire of feeding methods, including the bubble net feeding 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. There are at least 80.000 humpback whales worldwide. Once hunted to the Brink of extinction, humpbacks are now sought by whale-watchers, particularly off parts of Australia, New Zealand, South America, Canada, and the United States.

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. Though Cleary 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 the Humpback is more closely related to Certain rorquals, particularly the fin whale (Balaenoptera physalus), and possibly to the gray whale (Eschrichtius robustus), than it is to rorquals Such as the minke whales. The humpback whale was first Identified as "baleine de la Nouvelle Angleterre" by Mathurin Jacques Brisson in his Regnum Animale of 1756. 

The specific name means" New Englander "and was Probably given by Brisson due the regular sightings of humpbacks off the coast of New England Humpback whales can easily be Identified by Their stocky bodies with obvious humps and black dorsal coloring. North Pacific, Atlantic, and Southern Ocean humpbacks have distinct migratory Populations the which complete a round-trip each year. The Indian Ocean population does not migrate, prevented by That ocean's northern coastline. Several hypotheses Attempt to explain the humpback's pectoral fins, the which are proportionally The Longest fins of any cetacean. Humpbacks also have 'rete mirable' a heat exchanging system, the which works similarly in humpbacks, sharks and other fish.

Humpbacks have 270 to 400 Darkly colored baleen plates on each side of the mouth. Humpbacks have a 3 meters (9.8 ft) heart-shaped to Bushy blow, or exhalation of water through the blowholes. Because Humpback Whales breathe voluntarily, researchershave That said it is poss ible That the whales shut off only half of the brain Pls sleeping. Early Whalers also noted blows from humpback adults to be 10-20 feet (3.0-6.1 m) high. Humpback milk is 50% fat and pink in color. Males reach sexual maturity at approximately 7 years of age. The humpback whale lifespan ranges from 45-100 years Fully grown, the males average 15-16 meters (49-52 ft). This Visually distinguishes males and females. Male whales have distinctive scars on heads and bodies, some resulting from battles over females.

The varying patterns on the tail flukes are sufficient to identify individuals. Unique visual identification is not currently possible in most cetacean species (other exceptions include orcas and right whales), humpback making the species a popular study. A photographic catalog of all known North Atlantic whales was developed over this period and is currently maintained by the College of the Atlantic Similar photographic identification projects have Begun in the North Pacific by SPLASH (Structure of Populations, Levels of Abundance and Status of Humpbacks), and around the world. Both male and female humpback whales vocalize, however only the males Produce long, loud, complex "songs" for the which the species is famous. Cetaceans have no vocal cords, whales generate so Their song by forcing water through Their massive nasal cavities.

Whales within a large area sing the same song. All North Atlantic humpbacks 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 without repeating Scientists are unsure of the purpose of whale song. Only males sing, suggesting That one purpose is to attract females. Scientists hypothesize That may keep singing Populations migrating connected. Identified by Their unique tail patterns, these animals made The Longest documented mammalian migration In Australia, two main migratory Populations have been Identified, off the west and east coast respectively. Most monitored stocks of humpback whales have rebounded well since the end of Commercial Whaling, Such as the North Atlantic where stocks are now believed to be approaching pre-hunting levels. However, the species is Considered endangered in some countries, including the United States The United States initiated a status review of the species on August 12, 2009, and is seeking public comment on potential changes to the species listing under the U.S. Endangered Species Act Areas where population data is limited and the species may be at higher risk include the Arabian Sea, the western North Pacific Ocean, the west coast of Africa and parts of Oceania Today, individuals are vulnerable to collisions with ships, entanglement in fishing gear, pollution and noise Like other cetaceans, humpbacks can be injured by excessive noise. In the 19th century, two humpback whales were the resource persons found dead near sites of repeated oceanic sub-bottom blasting, with traumatic injuries and fractures in the ears Once hunted to the Brink of extinction, the humpback has made a dramatic comeback in the North Pacific. A 2008 study estimates the humpback population That That hit a low of 1.500 whales before hunting was banned worldwide, has made a comeback to a population of the between 18.000 and 20.000 Saxitoxin, a paralytic shellfish poisoning (PSP) from contaminated mackerel has been implicated in humpback whale DeathsThe United Kingdom, Among other countries, designated the humpback as a priority species under the national Biodiversity Action PlanIn August 2008, the IUCN changed humpback's status from Vulnerable to Least Concern, although two sub populations Remain endangered The United States is considering Populations of humpback separate listing, so That Smaller groups, Such as North Pacific humpbacks, the which are estimated to number from 18.000 to 20.000 animals, Might Be delisted.

Sperm Whale

  

The Life of Animals | Sperm Whale | The sperm whale, Physeter macrocephalus, is a marine mammal species, order Cetacea, a toothed whale (odontocete) having the largest brain of any animal. The name comes from the milky-white waxy substance, spermaceti, found in the animal's head. The sperm whale is the only living member of genus Physeter. It is one of three extant species in the sperm whale superfamily, along with the pygmy sperm whale and dwarf sperm whale.

A bull can grow to 20.5 metres (67 ft) long. It is the largest living toothed animal. The sperm whale's clicking vocalization is the loudest sound produced by any animal, but its functions are uncertain. These whales live in groups called pods. Pods of females and their young live separately from older males. The sperm whale has few natural predators, since few are strong enough to successfully attack a healthy adult; orcas attack pods and kill calves. The sperm whale can live for more than 70 years.

Historically, the sperm whale was also known as the common cachalot; "cachalot" is derived from an archaic French word for "tooth". Over most of the period from the early 18th century until the late 20th century, the sperm whale was hunted to obtain spermaceti and other products, such as sperm oil and ambergris. Due to its size, the sperm whale could sometimes defend itself effectively against whalers. In the most famous example, a sperm whale attacked and sank the American whaleship Essex in 1820. As a result of whaling, the sperm whale is currently listed as vulnerable by the IUCN. The name sperm whale is an apocopation of spermaceti whale. The sperm whale is the largest toothed whale, with adult males measuring up to 20.5 metres (67 ft) long and weighing up to 57,000 kilograms (56 long tons; 63 short tons). By contrast, the second largest toothed whale, Baird's Beaked Whale measures 12.8 metres (42 ft) and weighs up to 15 short tons (14,000 kg) The Nantucket Whaling Museum has a 5.5 metres (18 ft)-long jawbone. 

At birth both sexes are about the same size but mature males are typically 30% to 50% longer and three times as massive as females The sperm whale has 20 to 26 teeth on each side of its lower jaw The teeth are cone-shaped and weigh up to 1 kilogram (2.2 lb) The purpose of the teeth is unknown. Teeth do not appear to be necessary for capturing or eating squid, and well-fed animals have been found without teeth. The brain is the largest known of any modern or extinct animal, weighing on average about 8 kilograms (18 lb), though the sperm whale has a lower encephalization quotient than many other whale and dolphin species, lower than that of non-human anthropoid apes, and much lower than humans'. Like other toothed whales (suborder odontoceti), sperm whales use echolocation as one means to find food because their habitat has favorable acoustic characteristics, and light absorption by water and suspended material limits visual range. The whale emits a focused wide angle beam of high-frequency clicks. The lower jaw is the primary echo reception path. The sperm whale is among the most cosmopolitan species. It prefers ice-free waters over 1,000 metres (3,300 ft) deep Although both sexes range through temperate and tropical oceans and seas, only adult males populate higher latitudes It inhabits the Mediterranean Sea, but not the Black Sea while its presence in the Red Sea is uncertain The shallow entrances to both the Black Sea and the Red Sea may account for their absence The Black Sea's lower layers are also anoxic and contain high concentrations of sulphur compounds such as hydrogen sulphide

Coastal areas with significant sperm whale populations include the Azores and the Caribbean island of DominicaSperm whales can live 70 years or more.Calves can suckle from females other than their mothers Females generally have birth intervals of three to six years Females reach sexual maturity between 7 and 13 years; males follow beginning at 18 years. Females remain at lower latitudes Males reach their full size at about age Sperm whales are not the easiest of whales to watch, due to their long dive times and ability to travel long distances underwater. However, due to the distinctive look and large size of the whale, watching is increasingly popular. Sperm whale watchers often use hydrophones to listen to the clicks of the whales and locate them before they surface.

Beluga Whale

 

The Life of Animals | Beluga whale | The beluga or white whale, Delphinapterus leucas, is an Arctic and sub-Arctic cetacean. This marine mammal is commonly Referred to simply as the Beluga or Sea Canary due to its high-pitched twitter It is up to 5 m (16 ft) in length and an unmistakable all-white color with a distinctive protuberance on the head. Populations of seven Canadian beluga, two are listed as endangered, inhabiting eastern Hudson Bay, and Ungava Bay.

In 1776, Peter Simon Pallas first described the beluga It is a member of the family Monodontidae, the which is in turn part of the toothed whale suborder of The Irrawaddy dolphin was once placed in the same series; however, recent genetic evidence Suggests Otherwise The narwhal is The only other species within the Monodontidae besides the beluga The Red List of Threatened Species Both Gives and white beluga whale as common names, though the former is now more popular. It is Sometimes Referred to by Scientists as the belukha whale to avoid confusion with the beluga sturgeon.

A Japanese researcher says he taught a beluga to "talk" by using these sounds to identify three different objects, offering Hope that Humans may one day be Able to Communicate effectively with sea Mammals Female belugas are larger than females. Calves, however, are usually gray That Its head is unlike any other of cetaceans. The beluga's melon is extremely bulbous and even malleable The beluga is Able to change the shape of its head by blowing water around its sinuses. Unlike many Dolphins and whales, the vertebrae in the neck are not Fused together, allowing the animal to turn its head laterally. 

Belugas have a dorsal ridge, rather than a dorsal fin the absence of the dorsal fin is reflected in the genus name of the species-apterus the Greek word for "wingless." The beluga inhabits a discontinuous Circumpolar distribution in Arctic and sub-Arctic waters ranging from 50 ° N to 80 ° N, particularly along the coasts of Alaska, Canada, Greenland, and Russia.  Lawrence River estuary and the Saguenay fjord, around the village of Tadoussac, Quebec, in the Atlantic and the Amur River delta, the Shantar Surrounding Islands and the waters of Sakhalin Island in the Sea of Okhotsk

In the spring, the Beluga moves to its summer grounds: bays, estuaries and other shallow inlets. These summer sites are discontinuous. Beluga may also find pockets of water trapped under the ice. The beluga's ability to find the thin slivers of open water within a dense ice pack may cover more than That 96% of the surface mystifies Scientists. Its echo-location capabilities are highly adapted to the sub-ice sea's Peculiar acoustics and it has been suggested That belugas can sense open water through echo-location.

Experts Those Identified as the bones of a beluga.  Today, the Charlotte whale aids in the study of the geology and the history of the Champlain Basin and this fossil is now the official Vermont State Fossil (making Vermont the only official state fossil Whose Is that of a still extant animal). On June 9, 2006, a young beluga carcass was found in the Tanana River near Fairbanks in central Alaska, Nearly 1.700 kilometers (1,100 mi) from the nearest ocean habitats. Sometimes Belugas follow migrating fish, leading Alaska state biologist Tom Seaton to speculate That it Had Followed salmon migrating up the river at some point in the prior fall. Belugas are highly Sociable. Groups of males may number in the Hundreds, while mothers with calves Generally mix in slightly Smaller groups. Pods growing niche to be unstable, meaning That They growing niche to move from pod to pod. Mothers and calves form the beluga's Closest social relationships. Belugas can be playful, They may spit at Humans or other whales.  Unlike most whales, it is capable of swimming backwards. Female belugas typically give birth to one calf every three years Most Occurs ing the between February and May, but some ing Occurs at other times of year. It is questionable whether the beluga has delayed implantation gestation Lasts 12 to 14.5 months Calves are born over a protracted period, That varies by location. The global population of belugas today stands at about 100,000. There are estimated to be 40.000 individuals in the Beaufort Sea, Hudson Bay in 25.045, 18.500 in the Bering Sea, and 28.008 in the Canadian Low Arctic. The population in the St. Lawrence estuary is estimated to be around 1.000 It is Considered an excellent sentinel species (indicators of environment health and changes). 

Because the Beluga congregates in river estuaries, pollution is proving to be a significant health danger. Levels the between 240 ppm and 800 ppm of PCBs have been found, with males typically having higher levels, the long-term effects of this pollution on the affected Populations is not known. While some Populations tolerate small boats, others actively try to avoid ships.  Indigenous Whaling Continues in these areas, and some Populations continue to decline.  As of 2008, the beluga is listed as "near Threatened" by the IUCN, due to uncertainty about the number of belugas over parts of its range (ESPECIALLY the Russian Arctic), and the expectation That Efforts cease if current conservation, ESPECIALLY hunting management , the beluga population is Likely to qualify for "Threatened" status within five years. Prior to 2008, the beluga was listed as "vulnerable", a higher level of concern. IUCN cited the stability of the largest subpopulations and improved census methods That indicate a larger population than Previously estimated To Prevent hunting, belugas are protected under the International Moratorium on Commercial Whaling; however, small amounts of Beluga Whaling are still allowed. 

To Prevent whales from coming in contact with industrial waste, the Alaskan and Canadian Governments are Relocating and waste sites where whales come in contact. Healthy captive belugas are Important Because They are one of the only whales found in many marine aquariums. The high numbers of Captives adds to the threat to the beluga population, while Their carcasses Contribute to scientific research. The Cook Inlet subpopulation is listed as "Critically Endangered" by the IUCN as of 2006 of The Cook Inlet beluga population is listed as Endangered under the Endangered Species Act as of October 2008. This was due to overharvesting of belugas prior to 1998. The beluga whale is listed on Appendix II of the Convention on the Conservation of Migratory Species of Wild Animals (CMS).

Basilosaurus

The Life of Animals | Basilosaurus | Basilosaurus averaged about 18 meters (60 ft) in length, and is believed to have been the largest animal to have lived in its time  It displayed an unparalleled degree of elongation compared with modern whales. Their very small vestigial hind limbs have also been a matter of interest for paleontologists. The species is the state fossil of Mississippi and Alabama in the United States.

  
Vertebrae were sent to the American Philosophical Society by a Judge Bly of Arkansas and Judge John Creagh of Clarke County, Alabama. With some reservation, Harlan speculated that the fossils belonged to a (50 m [166 ft] long) marine reptile, for which he suggested the name Basilosaurus, meaning “King reptile’’ Owen proposed renaming the find to Zeuglodon cetoides (“whale-like yoke teeth”), which is now a junior synonym; though the latter is considered by many to be a more fitting name, the first-published name always takes precedence. The name Zeuglodon refers to the double rooted teeth typical of marine mammals.
 

The remains were eventually destroyed in the Great Chicago Fire. In 1894 Smithsonian curator Charles Schuchert went to Alabama and collected fossil bones in order to mount the first scientifically accurate specimen. It is still on display today in the National Museum of Natural History, the only real specimen currently exhibited in the world  There is a plaster cast on display in the Alabama Museum of Natural History. Fossil finds of another related species, Basilosaurus isis, have been found in the aptly named Valley of the Whales in Egypt. The fossils were very well preserved, hind limbs included, and were rather numerous. Paleontologist Philip Gingerich, who organized several expeditions to the valley, speculated that Egyptian crocodile worship may have been inspired by the huge skeletons that lay there. Fossil remains of another species, Basilosaurus drazindai, have been found in Pakistan. Another fossilized species named Basiloterus husseini was its closest known relative, but was not as large or elongated. Basilosaurus was highly elongated. It is also believed to have had unusual locomotion, compared with all other cetaceans; similarly sized thoracic, lumbar, sacral and caudal vertebrae imply that Basilosaurus moved in an anguilliform (eel-like) fashion, only vertically. Most reconstructions show a small, speculative dorsal fin similar to a rorqual whale’s, but other reconstructions show a dorsal ridge. The whale also possessed small, 0.6 meter (2 ft) hind limbs, which clearly cannot aid locomotion on a 15-22 meter (50-72 foot) animal. Judging from the relatively weak axial musculature and the thick bones in the limbs, The head of Basilosaurus did not have room for a melon like modern day toothed whales, and the brain was smaller in comparison as well.

Orca (Orcinus orca)

 

  

The Life of Animals | Orca (Orcinus orca) | Orca (Orcinus orca) is the largest species of the dolphin family. This species is found in all oceans, from the cold regions like the Arctic and Antarctica to the warm temperate regions. Killer whales are predators, eating mostly fish populations, comparison with other populations  eat marine mammals like sea lions, seals, walruses to large whales.
 

Killer whales hunt in deadly groups, family groups consisting of up to 40 individuals. There seemed a good group of permanent and temporary groups of the population of killer whales. Different groups are hunting the prey is different and uses different techniques in catching prey.

Permanent groups tend to prefer fish, while the group while targeting marine mammals. All groups using the techniques of effective and cooperative hunting, which is sometimes equated with the behavior of wolves.

Whales have a wide diversity in terms of communication via voice, and each group has a different sound, which can be recognized by members of the group even from a great distance They use echolocation to communicate and hunt, making sounds that were able to cross under the water until it met with an object, and then reflected back so that it can reveal the location, size, and shape of the object.

Killer whales are very protective of her child and adolescent females often assist the mother caring for children. Parent killer whales give birth every 3 to 10 years, after 17 months of pregnancy. Orca quickly known for their colors are black and white flashy and smart, well-trained star performances in the aquarium. Killer whales themselves have never been extensively hunted by humans.