Information about blue whales

Blue whale, also known as "razor whale", is the largest and heaviest animal on the earth, belonging to Mammalia, Cetacea and Cyprinidae. Widely distributed, in the ocean from the North Pole to the South Pole. The blue whale has a slender body and a blue-gray back, but sometimes it looks lighter in water. At present, there are at least three subspecies of blue whales: B.M. musculus, which lives in the North Atlantic and the North Pacific; The middle blue whale living in the Antarctic Ocean and the short-tailed blue whale living in the Indian Ocean and the South Pacific Ocean. B. m. indica found in the Indian Ocean may be another subspecies. Like other baleen whales, blue whales mainly feed on small crustaceans (such as krill) and small fish, sometimes including squid.

The blue whale (scientific name: Balaenoptera musculus) is a marine mammal belonging to the suborder baleen whales. The blue whale is considered to be the largest animal in the history of the earth, with a body length of 33 meters and a weight of 160 tons. Blue whales have slender bodies and blue-gray backs, but sometimes they look pale in the water. Until the beginning of the 20th century, there were a considerable number of blue whales in almost every sea area in the world. After more than 40 years, they were almost extinct because of whaling. It was not until 1966 that the international community began to protect blue whales that the number of blue whales gradually increased. A report in 2002 estimated that the number of blue whales in the world ranged from 5000 to 12000, and they were distributed in at least five ethnic groups. Recent research on pygmy blue whales shows that this number may underestimate the actual number. Before whaling began, the largest population of blue whales was in Antarctic waters, with an estimated population of about 239,000 (ranging from 202,000 to 365,438+065,438+0,000). At present, the number of northeast Pacific Ocean, Antarctic Sea and Indian Ocean has been greatly reduced (about 2000 each). There are two large groups in the North Atlantic and at least two groups in the Southern Hemisphere. Habitat: There are many waters near the South Pole in the ocean from the North Pole to the South Pole.

Photo Gallery of Blue Whales (18 photos) Feeding habits: mainly feeding on krill, but also swallowing some crustaceans such as copepods. Characteristics and habits of zooplankton: group habits are not obvious. Pregnancy: 12 months. The blue whale is a species in the baleen whale family, and the members of this family also include large wing whales, humpback whales, fat whales, Brucella whales and minke whales. The baleen family is thought to have been separated from other families of the suborder baleen as early as the middle Oligocene. However, it is still unknown when the members of the whale family began to separate and evolve from each other. Blue whales are usually classified as a kind of baleen whales. Although some scholars classify it as another haplotype-sibbaldus, this classification method has not been accepted by other scholars. DNA sequence analysis shows that blue whales are closer to humpback whales and gray whales than other species to which they belong. If further tests can confirm this relationship, it is necessary to reclassify baleen whales. The blue whale is one of the seven species of Zombie. However, DNA sequencing analysis shows that blue whales are closer to humpback whales and gray whales than other species in their genus. There are at least 1 1 articles about adult offspring of blue whale/fin whale hybridization. At present, it is also known that blue whales and large-winged whales have crossed. Aronson and Gerberg (1983) think that the difference between blue whales and fin whales is similar to that between humans and gorillas. It is generally believed that cetaceans were separated from other families of baleen suborder as early as the middle Oligocene. But I don't know when the members of these plates separated. Phylogenetic Tree of Animals Related to Blue Whale Some authoritative organizations divide this species into three subspecies: small blue whales, including populations in the North Atlantic and the North Pacific; Intermediate pomfret, including the Southern Ocean population; Brevica

Blue whale picture appreciation (20 photos) uda (also known as pygmy blue whale), including the Indian Ocean and South Pacific population. Early authorities listed the Indian Ocean population as a subspecies called B. m. indica. But unlike the other three subspecies, the name of the last subspecies did not appear on the red list of endangered species. At present, these two classification methods are still questioned by some scientists; Genetic analysis shows that there are only two subspecies. The species name of the blue whale musculus comes from Latin, which means "strong", but it can also be translated as "little mouse". In 1758, Linnai completed the naming of this species in his groundbreaking book "Natural System". He probably knew this, and then humorously used this ironic pun. Herman melville called the blue whale "sulfur bottom" in Moby Dick. Because diatoms are attached to the skin of blue whales, their underside is orange-brown or yellowish, so they are also called sulfur whales. Other common names are Sebad whale, Sibbald Rorqul (named by Robert Sebad), Great Blue Whale, Great Northern Whale and Great Northern Rorqul, but these names have been gradually forgotten in recent decades. At present, authoritative experts divide the blue whale into three or four subspecies: the northern blue whale includes ethnic groups in the North Pacific and the North Atlantic, the southern blue whale living in the Antarctic Sea, the pygmy blue whale found in the Indian Ocean and the South Pacific, and another subspecies still in doubt: the Great Indian blue whale, also found in the Indian Ocean, although this subspecies was previously suspected to be pygmy blue whale.

Edit the biological distribution of this section

It is distributed all over the world, with the largest number of Antarctic waters, mainly in temperate and frigid waters with water temperature of 5 ~ 20℃, and a few whales have been to the Yellow Sea and the waters of Taiwan Province Province. Blue whale is one of the most important economic species and contains a lot of fat. Internationally, it is stipulated that the oil production of blue whales should be used as the conversion unit, that is, 1 blue whales =2 fin whales =2.5 humpback whales =6 fin whales. Since modern whaling began, blue whales have been caught indiscriminately. During the peak period of 1930 ~ 3 1, nearly 30,000 blue whales were killed worldwide. 1966, the international whaling commission declared the blue whale as a protected object. Before the development, there were at least 200,000 blue whales, and now it is estimated that there are at most13,000 blue whales. According to the statistical report published by the International Whaling Commission 1989, there are only 200 ~ 453 blue whales. This is based on an eight-year survey in the southern hemisphere, which is on the verge of extinction. Since whaling was banned, the number of blue whales in the world has remained basically unchanged, about 3000-4000. Since the establishment of the Red List of Endangered Species, the blue whale has been listed as an endangered species on the Red List. There are about 2,000 blue whales in the northeastern Pacific Ocean, which are concentrated between Alaska and Costa Rica, but they are common in California in summer. In the long run, this number is the hope of increasing the number of blue whales. Sometimes they drift to the northwest Pacific; It is recorded between kamchatka peninsula and the northern end of Japan. The population of southern ocean blue whale is between 750- 1200, and the migration mode of this population is not well understood. They may be different from the uncertain people who often appear on the northeast coast of Sri Lanka. Some blue whales in the Southern Ocean population are close to the east coast of the South Pacific. In Chile, people found blue whales gathering on the coast of Lu Zhi Island for food, so the Chilean Whale Conservation Center, with the support of the Chilean navy, conducted extensive research and protection on them. There are two populations of blue whales living in the North Atlantic. The first one is located in Greenland, Newfoundland, Nova Scotia and St. Lawrence Bay. It is estimated that there are about 500 heads. The second one is farther east, in the Azores in spring and in Iceland in July and August. It is speculated that whales move between these two volcanic islands along the mid-Atlantic ridge. In addition to Iceland, although extremely rare, blue whales can also be found in Svalbard and Jan Mayen. Scientists don't know where these blue whales spend the winter. The population of the whole North Atlantic is between 600- 1500. Humans pose a threat to the recovery of the blue whale population. Polychlorinated biphenyls (PCBs) chemicals will accumulate in the blood of blue whales, leading to premature death of blue whales. At the same time, the noise caused by increasing ocean transportation will mask the sound of blue whales, making it difficult for them to find a mate.

Edit this physical feature dna

An adult blue whale can grow to 30 times the weight of an African elephant. The average length of blue whales is about 26 meters, and the highest record is about 33.5 meters. The female whale is bigger than the male whale, and the southern blue whale is bigger than the northern blue whale. Seen from above, the kiss is wide and flat. The dorsal fin of the blue whale is very small, about 0.4m high, and 1/4 is behind the body. The flippers are small, accounting for 15% of the body length. The caudal fin is 1/3 to 1/4 in length, and the trailing edge is straight. There are 55 ~ 88 puncture grooves, the longest of which can reach the navel. 270 ~ 395 whiskers per side. The back of the body is dark gray-blue, the abdomen is slightly light, and the mouth must be black. Blue whales are different from other kinds of whales. They are short and strong, while the vertebral body of blue whales is very long and looks like it has been elongated. The head is flat and U-shaped, and the pores from the upper lip to the back have obvious ridges. There are dense baleen plates at the front of the mouth, and about 300 baleen plates (about 1 m long) hang down from the upper jaw and pass through the mouth for about half a meter. 60-90 grooves (called abdominal folds) are parallel to the body along the throat. These folds are used to discharge seawater that has been swallowed in large quantities (see the section on "predation"). The dorsal fin of the blue whale is so small that it can only be seen briefly when diving. The shape of dorsal fin varies from individual to individual; Some fins have only one protrusion just visible, while others are very eye-catching and sickle-shaped. The dorsal fin is located about three-quarters of the body length. When reaching the surface to breathe, blue whales lift their shoulders and stomata off the water to a greater extent than other large whales (such as fin whales and pomfret). This can usually be used as a useful clue to identify marine species. When breathing, if it is calm, the spectacular vertical water column (up to 12 m, usually 9 m) ejected by the blue whale can be seen thousands of meters away. The vital capacity of the blue whale is 5000 liters. The fin foot of a blue whale is 3-4 meters long. The top is gray and the narrow side is white. The bottom is all white. The head and caudal fin are generally gray. But the back and sometimes flippers are usually variegated. The degree of variegated color varies from person to person, and the difference is obvious. Some may be gray all over, some are dark blue, and gray and dark blue are quite mixed (gray-blue). When blue whales interact with other whales, they can sprint at a speed of 50 km/h (30 mph), but usually swim at a speed of 20 km/h (12 mph). Slow down to 5km/h(3 mph) when eating. Blue whales in the North Atlantic and the North Pacific lift their tail fins when diving, but most other blue whales don't. The blue whale is the largest animal on the earth at present. An adult blue whale can grow to more than twice the weight of brachiosaurus, the largest dinosaur that once lived on the ground. The blue whale is also the largest animal that once lived on land. The largest known creature in the dinosaur era is the Mesozoic Argentinean dragon, which is estimated to be 90 tons (100 short tons). The weight of the largest blue whale is uncertain. Most of the data are taken from blue whales killed in Antarctic waters in the first half of the 20th century, and the data are measured by whalers who are not proficient in standard animal measurement methods. The longest whales recorded are two females, 33.6 meters (1 10 ft 3 in) and 33.3 meters (109 ft 3 in) respectively. However, the reliability of these measurements is controversial. The longest whale measured by scientists at the National Marine Mammal Laboratory (NMML) is 29.9 meters (98 feet), which is about the length of a Boeing 737 or three double-decker buses. The head of the blue whale is so big that 50 people can stand on its tongue. Its heart is as big as a car. Babies can climb through its arteries, and newborn blue whale cubs are heavier than an adult elephant. In the first seven months of life, young whales drink 400 liters (100 liter of American gallon) of breast milk every day. Young whales grow very fast, gaining 90 kilograms (200 pounds) every 24 hours. Because the blue whale is huge, we can't weigh it directly. Most blue whales are not weighed by the whole head, and whalers will cut them into appropriate sizes before weighing them. This way underestimates the weight of the blue whale, because it will lose blood and other body fluids. Even so, it is recorded that a whale 27 meters (88 feet 6 inches) long weighs 150- 170 tons (160- 190 short tons). NMML scientists believe that whales 30 meters (98 feet) long are estimated to exceed 180 tons (200 short tons). At present, the maximum weight of blue whale accurately measured by NMML scientists is 177 tons (197 short tons). Females are bigger than males, and southern blue whales are bigger than northern blue whales. Seen from above, the kiss is wide and flat. The dorsal fin is small, about 0.4m high, and 1/4 is at the back of the body. The flippers are small, accounting for 15% of the body length. The caudal fin is 1/3 to 1/4 in length, and the trailing edge is straight. There are 55 ~ 88 puncture grooves, the longest of which can reach the navel. 270 ~ 395 whiskers per side. The back of the body is dark gray-blue, the abdomen is slightly light, and the mouth must be black. Blue whales are stupid and ugly.

Edit the living habits of this paragraph.

Blue whales feed on plankton, mainly krill. A blue whale consumes 2 ~ 4t food every day. blue whale

The swimming speed is 2 ~ 6 km/h when feeding, 5 ~ 33 km when migrating, and the maximum forced speed is 20 ~ 48 km per hour. General 10 ~ 20 dive is followed by a deep dive. Shallow dive interval 12 ~ 20 seconds, deep dive sustainable 10 ~ 30 minutes. The spray column is narrow and straight, with a height of 6 ~ 12m. The blue whale is sexually mature at the age of 10. Northern blue whales breed and mate in late autumn and early winter. The southern hemisphere mates in the south in winter, with the peak in July. The reproductive period between the northern and southern hemispheres is half a year apart. The gestation period is 10 ~ 1 1 month. The calf is 6 ~ 7 meters long and weighs about 6 tons. The lactation period is half a year, and the weaning time can reach 16m. The highest age is estimated to be between 30 and 80-90. Whales will woo by calling.

Edit the copy of this paragraph.

Most blue whales breed in winter. The mother whale was pregnant for one year before giving birth to her calf. This newborn whale is about 7.5 meters long and weighs about 6 tons. After feeding for 24 hours, its weight can increase by about 100 kg, with an average increase of about 75 grams per minute. After seven months of breastfeeding, the young whale can reach about 23 tons in weight and 0/6 meter in length, and begins to learn to swallow all kinds of plankton with its mouth open. Little blue whales don't come of age until they are five years old.

Edit the predation characteristics of this paragraph

Krill is the main food of blue whales, and the plankton eaten by blue whales belong to different species according to different marine areas. In the North Atlantic, northern krill, African krill, African krill and long-tailed krill are the main foods of blue whales. In the North Pacific, krill, sea mulberry, sea mulberry with long handle, sea mulberry and sea mulberry are the main foods; In Antarctica, Antarctic krill, Crystal krill and Varan krill are the main foods of blue whales. blue whale

Blue whales usually prey on the densest krill they can find, which means that blue whales need to feed in deep water (100 meters or more) during the day and can only feed on the surface at night. The diving time of blue whales foraging is generally 10 minute. It is not unusual to dive for 20 minutes, and the longest diving time is 36 minutes (Sears, 1998). In the process of hunting, blue whales swallow a large group of krill at a time and a lot of seawater at the same time. Then squeeze the abdominal cavity and tongue, and squeeze the seawater out through the baleen. When the seawater in the mouth is completely discharged, the blue whale will swallow the remaining krill that cannot pass through the baleen whale board.

Edit this life cycle

Blue whales begin to mate after autumn and continue until the end of winter. We know nothing about mating behavior and breeding grounds. Females give birth every 2-3 years, usually in the early winter after 10- 12 months of pregnancy. This calf weighs about 2.5 tons and is about 7 meters long. About six months later, the calf was weaned and its length doubled. Blue whales generally reach sexual maturity at the age of 8- 10, when the males are at least 20 meters long (longer in the southern hemisphere). The female is relatively large and sexually mature at about 5 years old. At this time, the body length is about 2 1 m. Scientists estimate that the life span of blue whales is at least 80 years; However, since individual records cannot be traced back to the whaling era, it will take many years to determine the exact life span of whales. The longest recorded research on a single individual was conducted in the Northeast Pacific for 34 years (Sears 1998 report). The natural enemy of the blue whale is the killer whale. Calambokidis et al. (1990) found that 25% of adult blue whales have scars left by killer whale attacks. However, there is no exact data on the death rate caused by the attack. It is rare for a blue whale to run aground. Because of its special group structure, we have never heard of the stranding of blue whales. But when the grounding does happen, it will attract much attention. 1920, a blue whale ran aground on the beach of Lewis Island, Hebrides Island outside Scotland. It was hit on the head by a whaling ship, but the harpoon didn't explode. Like other animals, blue whales instinctively keep breathing at all costs. Stranding can keep it from drowning. Two whales are standing on the roadside of Luis Island.

Edit this passage of the blue whale.

The blue whale is the loudest animal in the world. Cummings and Thompson (197 1 year) and Richardson et al. (1995) said that the sound of the blue whale can reach 1 55-/kloc-0 at the sound source by measuring the reference pressure at the distance from the blue whale1meter. Even considering the different impedances and standard reference pressures of water and air, the equivalent range in air is still 89- 122 dB. In contrast, the sound of a pneumatic drill is about 100 decibel. But humans may not realize that the blue whale is the loudest animal. The fundamental frequency of all blue whale populations is 10-40 Hz, and the lowest frequency that humans can detect is 20 Hz. The sound duration of the blue whale is 10-30 seconds. According to records, the sound of blue whales off the coast of Sri Lanka repeatedly sings a four-note "song", which lasts for two minutes at a time, reminding people of the song of humpback whales. The researchers believe that because this phenomenon has not been seen in other populations, it may be unique to B. m. brevicauda (dwarf) subspecies. blue whale

Scientists don't know why blue whales make sounds. Richardson et al. (1995) gave the following reasons: 1. Keep the distance between individuals. 2. Identify the same species and individuals. 3. transmit environmental information (such as foraging, warning, courtship) 4. Keep in touch with the group (for example, communication between women and men) 5. Positioning geomorphological features 6. Positioning food (adapted from the biological opinion of the National Marine Fisheries Bureau in 2002) Why is the song of the blue whale getting deeper and deeper? In the 1960s, some scientists thought it would be very cool to put a large number of loudspeakers into the world ocean to record the songs of blue whales. Forty years later, some people who have studied the song of blue whales for 40 years have made a strange discovery. The song of every blue whale in the world is getting deeper every year. But as for the reason, they don't know. Although the language or geographical location is different, everyone living on the earth speaks more slowly every year, more like james earl jones. This slowdown is very small, less than one hertz per year, but the overall trend is relatively stable and sustainable. From global warming to increasingly serious noise pollution, people think that many factors may lead to this phenomenon. However, the impact of global warming on the ocean cannot be explained, which is mainly reflected in the change of acidity and density of seawater, and the sound made by blue whales will not change much. In contrast, noise pollution may be a more convincing explanation. Readers may wish to imagine that in a crowded bar, we can only raise our voice to attract the attention of the waiter. Assuming that blue whales can't accept high-pitched calls, it doesn't mean that every blue whale living in every ocean on this cursed planet has changed their behavior in the same way at the same time for 40 years.

Edit this part of the population and whaling

Blue whales are not easy to kill and preserve. The speed and strength of blue whales mean that they are usually not the target of early whalers, and they choose to kill sperm whales and right whales. When the number of these two whales decreased, whalers chose to kill more baleen whales, including blue whales. 1864, Swender Foyne, a Norwegian, assembled a harpoon for his boat to catch big whales. Although it was troublesome at first, this method soon became popular. /kloc-At the end of 0/9, the number of blue whales in the North Atlantic began to decrease. Because the blue whale has a thick layer of fat under its skin, it can be used to make soap and shoe polish. As a result, blue whales were killed in large numbers by whalers. Worldwide, the killing of blue whales has increased rapidly. By 1925, the United States, Britain and Japan followed Norway and joined the ranks of killing blue whales. They kill blue whales with "whaling ships" and then hang them on huge "factory ships" for processing. 1930, 4 1 ship slaughtered 28325 blue whales. At the end of World War II, the blue whale population was close to extinction. 1946 The quota limit of international whale trading was first introduced. These quotas are invalid because the agreement does not take into account the differences between different species. Rare species will be killed like more species. Due to human hunting and pollution of the marine environment, 1960, the International Whaling Commission began to ban the killing of blue whales. By this time, 350,000 blue whales have been killed, and the population in the world has been reduced to less than 1% before 100. At present, there are less than 50 blue whales in the world.

Edit this interesting reading

The blue whale is not only the largest whale, but also the largest living animal and the largest mammal to date. Generally, it is 2400-3400 cm long and weighs 150000-200 1000kg. In other words, its weight is equivalent to more than 25 African elephants, or the sum of the weights of 2000-3000 people. Fortunately, because of the buoyancy of the ocean, it doesn't need to support its weight as hard as land animals, and its huge body helps to keep a constant body temperature. The whole body surface of the blue whale is light blue or mouse gray, with thin stripes on the back, white spots on the chest and more than 20 folds, and the abdomen is covered with folds all the way to the navel with ochre spots. Female animals have cleavage on both sides of the reproductive opening with slender nipples inside. The head is small and flat, with two spray holes on the top of the head, a wide mouth, no teeth in the mouth and a wide upper jaw. It bulges upward in an arc shape, with 300-400 black whiskers on each side, 90-110cm long and 50-60cm wide. A large amount of earwax accumulates in the eardrum every year, and its age can be judged according to its thickness. It also has a white callus on its upper jaw, which used to be a place for long hair. Later, the hair degenerated, leaving a warty vegetation and becoming a breeding ground for parasites. Because this callus is different for each individual, just like wearing a hat with a different shape, different individuals can be distinguished accordingly. The dorsal fin is extremely short, the length is less than 0.5% of the body length of 65438+, and the flipper limb is not too long, about 4 meters, with four toes, no wavy notch at the back edge, and a wide and flat tail. The whole body is streamlined and looks like a razor, so it is also called "razor whale". The blue whale's body is so huge, one tongue has 2000 kilograms, the skull has 3000 kilograms, the liver has 1000 kilograms, the heart has 500 kilograms, the blood circulation reaches 8000 kilograms, and the testicles of male animals also have 45 kilograms. If its intestines are straightened, it is 200-300 meters long, its blood vessels are thick enough to hold a child, its dirty wall is more than 60 centimeters thick and its penis is 3 meters long. Its power is also amazing, and its power is about 1500- 1700 horsepower, making it a well-deserved Hercules in the animal kingdom. Blue whales are distributed in the oceans of the northern and southern hemispheres from the South Pole to the North Pole, especially near the South Pole, but they are rare in tropical waters. In China, it is distributed in the Yellow Sea, the East China Sea and the South China Sea, including the waters in the south and southwest of Taiwan Province Province. Despite its huge size, it usually moves slowly and often stands still, but it can rise and fall freely in the water and its tail swings flexibly. It is not only the driving force for progress, but also acts as a rudder, with a speed of 28 kilometers per hour. Most of the bays inhabited by blue whales are flooded with extremely rich organic matter in the river water on the landing land, which makes the water quality very fertile and promotes the massive reproduction of plankton. The dense plankton attracted a large group of krill, and their bodies shone blue like diamonds. Incredibly, the blue whale, a super-large animal, actually feeds on krill, a tiny animal. Its stomach is divided into four parts. The first stomach is formed by esophageal dilatation, so it eats a lot. It can swallow about 2 million krill at a time and eat 4000-8000 kilograms every day. If the food in its stomach is less than 2000 kilograms, it will feel hungry. Krill is the most abundant animal in the world, widely distributed in the Arctic and Antarctic waters. It is because there is such a rich food and there is no limit to support weight that blue whales can develop so much. Every day, it spends most of its time swimming in dense plankton. The two rows of plate-like tentacles on its mouth are like a sieve, and its belly has many folds like accordion bellows, which can be expanded and contracted, so that it can swallow seawater and krill together, and then when its mouth is closed, seawater is discharged from the tentacles, filtering out shrimp and fish and swallowing them. Blue whales eat other shrimps, small fish, jellyfish, diatoms and various plankton. In contrast, blue whales living in northern waters are smaller than those living in waters near Antarctica, which is generally considered to be closely related to the types and quantity of their food. Although blue whales live in the sea, like other mammals, they breathe with their lungs, which weigh more than 65,438+0,000 kilograms and can hold more than 65,438+0,000 liters of air. Such a large lung capacity greatly reduces the number of breaths, and only comes out to breathe once every 10- 15 minutes. When breathing, carbon dioxide and other waste gases in the lungs are discharged from the body through the nostrils, and then fresh oxygen is inhaled. Whenever its head comes out of the water to breathe, it will expel carbon dioxide and other waste gases from its body. When this powerful hot airflow rushes out of its nostrils, the jet height can reach about 10 meter, and it will also roll the nearby seawater out of the sea surface, and a spectacular water column will appear on the blue sea surface. From a distance, it looks like a fountain on the sea, and at the same time it makes a loud sound like a train whistle. People call it "jet tide". People can determine the position of the blue whale according to the sound it makes when breathing and the height and shape of the jet. Blue whales live in all oceans. It is extremely rare to see blue whales in China waters, and there are also records of blue whales in the Yellow Sea and the South China Sea. Generally speaking, its diving time does not exceed 100 meters, but some individuals can dive to a depth of 500 meters, and the diving time can last 10 ~ 20 minutes, followed by 8 ~ 15 continuous jet. Generally, whales don't raise their tails before diving, but blue whales always show their tails out of the water before diving, sometimes jumping out of the water very high, and then quickly diving into the water of 30-40 meters to find food. Usually, I also like to draw water with the tail fin, which is a versatile and versatile pastime. It may be playing a game, attracting the attention of its peers, or removing parasites from its skin. Although some people have seen 50-60 blue whales move in groups, they rarely form groups, most of them are lonely, or only 2-3 of them move together. Amphibious blue whales are very harmonious with each other, swimming, diving, foraging and breathing together, just like mandarin ducks, inseparable, often leaving a wide waterway behind them. Three blue whales get together, mostly females and a calf, close together, followed by males, about 3 meters apart. Blue whales breed in winter, and females are usually born every two years. Pregnancy 10- 12 months, each fetus only gives birth to 1 child. This calf weighs about 2.5 tons and is about 7 meters long. In order to prevent suffocation, the mother beast should lift her cub out of the water to take the first breath of air, and then she can breathe by herself. A pair of nipples of female animals grow on both sides of reproductive foramen, and swim in the upper layer of seawater when breastfeeding, and the young closely follow the tail of female animals. Because the larvae have no movable lips, they can't hold their nipples to suck milk. Female animals directly spray milk into their mouths by virtue of muscle contraction, which is also a good adaptation to life in water. Blue whale's milk is rich in nutrition, in which the fat content is 10 times that of milk, and the milk that young whales suck every day is above 1000 kg, so it develops rapidly. After 8 months, it can be increased to 65,438+05 m and its weight can be increased to 23,000 kg, so it can eat all kinds of plankton with its own mouth. By the age of two and a half to three, the body length can exceed 20 meters. The age of sexual maturity is about 8- 10 years old, and the life expectancy is generally over 50 years old, with the highest being 90- 100 years old. Of all animals, the blue whale makes the loudest sound. It uses a low-frequency and deafening sound when communicating with its partner. This kind of sound can sometimes exceed 180 decibels, which is louder than the sound you hear when a jet plane takes off on the runway. Sensitive instruments have detected the sound of blue whales 80 kilometers away.

Edit this rare traffic accident

According to the British Daily Mail, in June 2009, researchers from Oregon State University found a giant blue whale floating on the sea in the Santa Barbara Strait, and believed that the blue whale was killed after colliding with a ship in the Strait. According to the British Daily Mail, in June 2009, researchers from Oregon State University found a giant blue whale floating on the sea in the Santa Barbara Strait, and believed that the blue whale was killed after colliding with a ship in the Strait. blue whale

It is reported that the staff of the Institute of Marine Mammals of the university found this amazing scene when they went out to sea on a small research ship "Pacific Storm". The belly of the blue whale floats on the water, which is the largest animal ever killed by a passing ship. Researchers believe that the whale may have died after being violently hit by a cargo ship from Los Angeles. At that time, the Santa Barbara Strait was very busy and ships came and went. The staff of the university have not commented on this, and these pictures first appeared on the website of National Geographic magazine. The Pacific storm is 84 feet long. The researchers visually observed through field comparison that the whale was about 22 meters long. The picture is amazing and looks incredible.

Edit other threats in this paragraph.