Components of whale self-report

Hello everyone! Do you know me? I tell you, I am a famous whale, famous all over the world. Hey, my little friends, don't think we whales are fish. If you really think so, you are all wet. We whales belong to mammals. In addition, I want to reveal a little secret to those children who think I am a fish: it's time to supplement the biological "nutrition", hahahaha!

We whales are very big animals, and a small tongue alone is as heavy as a dozen big fat pigs! If we open our mouths, you humans will stand in our mouths and raise your hands without touching our maxilla. There are four people sitting around a table in our mouth, which is still very spacious! Well, look how big we are! Oh, by the way, tell you, don't say this to my ancestors. If they know, they will criticize me!

There are many members in our family, but everyone has their own living habits. Look, the first one to appear is our little brother-the baleen whale. He has no teeth, so his food is small fish and shrimp. The second one is my younger brother, whose name is needless to say. By the way, it's called toothed whale, and its teeth are extremely sharp, so we usually eat big fish and marine animals. That's our leader, the killer whale. He is very powerful. If he is angry, he will show disrespect!

We whales breathe with our lungs. When exhaling, it will float on the upper sea surface, and the exhaled air will form a water column. But the water column ejected by different kinds of whales is different: the water column of minke whales is vertical, thin and high; The water column of our toothed whale is inclined, thick and short. Look, we have a lot of knowledge about whales!

The way we sleep is also very fun. For the sake of safety, we always sleep in groups, with our heads inward and our tails outward in a circle.

We were viviparous, and we grew up drinking the mother whale's milk. Our growth rate is very fast, and we can grow 30-50 kilograms a day. And our life span is very long, we can live for decades-one hundred years.

After listening to my self-report, you will know something about our whales! If you come to see us in the future, I will certainly treat you warmly!

Whales are mammals and the largest animals in the ocean. Some whales are very big, the largest can reach more than 30 meters, and the smallest is more than 5 meters. At present, the largest known whale weighs about10.6 thousand kg, and the smallest is 2000 kg. A whale weighing nearly 40,000 kilograms and about 1.7 meters long was found in China. Whales look like fish and are spindle-shaped. Big head, small eyes and completely degenerated auricle. The neck is not obvious. The forelimbs are fin-shaped and the hind limbs are completely degenerated; Most species have fins on their backs; The tail is a horizontal fin, which is the main motor organ. Toothed or toothless. One or two nostrils, growing on the top of the head. There is no hair all over the body (many species only have some hair on their mouths). There is a thick layer of fat under the skin, which can keep warm and reduce the proportion of the body. Breathe with your lungs, then inhale on the surface and dive into the water. You can dive 10 ~ 45 minutes. They usually feed on plankton, mollusks and fish. Viviparous, usually each fetus gives birth to a child and feeds the calf with milk. But many people classify them as fish. In fact, they are not fish, but mammals. Distributed in the oceans of the world. The reproductive ability of whales is very poor, and it takes an average of two years to give birth to a calf. Due to the killing of human beings and the pollution of the marine environment, the number of whales has decreased sharply. For example, nearly 360,000 blue whales, the largest cetacean, were killed in the 20th century, and now there are less than 50 left. Whales are distributed in all the oceans in the world. It is an aquatic mammal that breathes with its lungs. Its species are divided into two categories: baleen whales, toothless whales, two-nostril baleen whales, baleen whales, blue whales, humpback whales, gray whales and other species, which are relatively mild; Toothed whales have teeth, no baleen whales, and usually have one or two nostrils. There are sperm whales, narwhals, killer whales and other species, which are more fierce. Most of the oxygen in the ocean and 60% of the oxygen in the atmosphere are made by phytoplankton. The baleen whale is the enemy that kills phytoplankton-zooplankton. In addition, toothed whales also help to maintain the ecological balance of fish. Toothed whales are large mollusks that feed on fish. Therefore, without whales in the world, human beings will perish. Cetaceans are characterized by constant body temperature, about 35.4℃. Bare skin, no body hair, only a few bristles on the nose and mouth, no sweat glands and sebaceous glands. The fat under the skin is very thick, which can keep the body temperature and reduce the proportion of the body in water. The skull is developed, but the skull is smaller, the face is larger, the frontal bone and maxilla are obviously prolonged, forming a long snout. The neck is not obvious, the cervical vertebra is healed, and the head is directly connected with the trunk. The forelimbs are fin-shaped, the toes are not separated, there are no claws, and the elbow and wrist joints cannot move flexibly, which is suitable for swimming in the water. The hind limbs are degenerated, but there are still pelvic and femoral residues, and residual bone fragments can be seen. The tail degenerates into fins, and the skin at the end expands horizontally from left to right, forming a pair of large tail leaves without bone support. The spine gradually tapers in the long and narrow caudal trunk and finally disappears before entering the caudal fin. Unlike fish, the caudal fin can swing up and down and is the main organ for swimming. Some species also have dorsal fins to balance their bodies. Their bones have spongy tissue, and there is more fat in the body cavity, which can increase the volume of the body, reduce the proportion of the body and increase buoyancy. Iraqi whale

Their eyes are small, without lacrimal glands and transient membranes, and their eyesight is poor. There is no outer ear shell, and the external auditory canal is very thin, but the hearing is very sensitive. It can feel ultrasonic waves, find food by echolocation, contact companions or avoid enemies. There are 1-2 external nostrils, located on the top of the head, commonly known as spray holes. Generally, the closer the nostril is, the higher the degree of evolution. Breathing with lungs, there is a lung on the left and right, and there are many capillaries in it, which are elastic and can help the circulation of oxygen and adapt to the gas exchange on the water. You need to surface for air every once in a while, and you can also dive for a long time. There are 10 20 pairs of ribs. The stomach is divided into four chambers. Most kidneys are tumor-like. Male testicles are located in the abdominal cavity. Female animals give birth and breastfeed in water. The uterus has two horns and a pair of breasts, which are located at the cleavage on both sides of the reproductive fissure, and the nipples are slender. Milk is rich in calcium, phosphorus and a lot of fat. Young whales have teeth in the embryonic period, but whales' teeth are replaced by beards at birth, and toothed whales' teeth are preserved for life. A whale is a mammal that lives in water. It has the same physiological characteristics as terrestrial mammals, such as breathing with lungs and viviparous, and is equipped with some special physiological structures evolved to adapt to the aquatic environment. Under Cetacea, there are two suborders, namely blaleenwhales and toothedwhales. The grouping of these two groups is mainly determined by their different feeding patterns. The main morphological feature of the suborder baleen whales is that they have no teeth, but there are great baleen whales, which can be used to screen plankton, so they are filter feeders. The main feature of Toothed Whale suborder is that it has teeth and is predatory, and the number and arrangement of teeth will be different from the direction of predation. There are about 79 species of 13 families in the world. Although the whale has the word fish, it is actually not a fish, but a mammal. It has many characteristics very different from fish. For example, the average fish swings its tail fin left and right to move forward, while the whale swings its tail fin up and down. They use the flippers at the front end to keep balance and control the direction of force. Some whales have fins at the upper end of their backs to keep their bodies upright. Whales are social animals. They usually live in groups in the sea, but when whales breathe, they need to swim to the surface. At this time, the whale breathes through the blowhole on its head, and when it exhales, the water in the air will condense and form the familiar fountain shape. Experts can even tell the species of whales from the height, width and angle of water spray. There are many kinds of whales, which can be roughly divided into toothed whales and baleen whales. Whales have a very thick layer of fat under their skin, which is also commonly known as whale oil. It can keep whales warm and store energy for a rainy day. Because whales have many special structures in their bodies, they can breathe in the water for a long time and slow down their heartbeat. Therefore, when it sinks to the bottom of the sea, it will take a long time to surface again. In addition to the oxygen storage structure, when a certain part of the body needs a lot of blood supply, the body will also have a special function of centralized supply. At present, at least five species of whales in the world 13 are on the verge of extinction because of human hunting. In order to protect whales, the International Whaling Commission banned commercial whaling from 1986, but this ban was relaxed in 1987, allowing limited whaling for research purposes. Despite widespread opposition, some countries (especially Japan) still kill whales in large numbers in the name of "scientific research" every year. Whales occasionally surface to breathe. Its nostrils are overhead. When it comes to the surface, it will spit out a column of water. Different whales have different water columns. The water column ejected by baleen whales is high and thin, while the water column ejected by toothed whales is thick and short. Experienced people can calculate the species, size and age of whales by observing the water column. We also know that whales are not fish. The creation of the Chinese character "whale" clearly shows that the ancients thought the whale was a big fish, not to mention the word "whale". We can't blame the word-makers for their lack of biological knowledge, because cetaceans, including whales, dolphins and porpoises (smaller dolphins), are really similar to fish: their long bodies are streamlined, their tails are leaflike, their hind limbs degenerate to nothing, and only a little residue can be found inside their bodies, all of which are suitable for living in water. whale

Scientists believe that mammals and dinosaurs entered the evolutionary stage at about the same time, and they did not live well in the era when giant reptiles were rampant. Dark clouds didn't have a chance until an extinction event-it is generally believed that an asteroid hit the earth 65 million years ago-destroyed the dinosaur family. During the Tertiary period between 50 million and 65 million years ago, all mammals lived on land, and the ancestors of modern whales were no exception. For some reason, some animals running on all fours began to return to rivers and oceans in Eocene 50 million years ago. In less than 8 million years, their body shapes and living habits have undergone tremendous changes. These discoveries, especially the bucky cetaceans, have excited scientists enough, because they are a transitional type between land mammals and modern cetaceans, and once again provide beautiful evidence for evolution. However, these transitional fossils are more inclined to the whale side, either amphibious or completely adapted to marine life. There are two important questions unanswered: What is the land ancestor of cetaceans-the most primitive cetaceans that can only run but not swim? Among the existing mammals in the world, which one has the closest relationship with cetaceans? Scientists are committed to studying the evolution of whales in more detail, and different professionals have different methods. According to the characteristics of fossil teeth and ears, paleontologists tend to think that whales are closely related to the middle class animals, which are extinct ungulates that lived in the tertiary period. Molecular biologists who study the DNA characteristics of existing animals prefer hippopotamus, believing that this modern cloven-hoofed animal is a close relative of whales. On September 20th this year, Tavison published a report in the British magazine Nature, saying that his team had newly discovered two kinds of ancient whale fossils from Pakistan, which were completely terrestrial. On the second day, gingerich reported in the American magazine Science that the other two ancient whale fossils also excavated in Pakistan have developed limbs and may be amphibians. It seems that there are only a few big names in each field, and these two are probably a little competitive. It is also interesting to publish a report on the same topic in two magazines of equal status. Their new findings show that cloven-hoofed animals such as cattle, hippos, pigs, camels and giraffes are closely related to whales. For gingerich, it may take a little more effort to put forward this view, because he originally claimed that the suborder HYMENOPTERA is a close relative of whales. In Greece, the word "whale" stands for sea behemoth. We divide whales into two groups: toothed whales: toothed marine behemoths, such as sperm whales, killer whales, dolphins and porpoises. Baleen whale; Fin whale In fact, these beards are horned teeth that grow in the mouth. They are used to filter water and catch shrimps and other small animals that whales eat. These teeth replace teeth. As far as the whole marine mammals are concerned, whales have the most species and the largest number. Whales can be divided into two categories: one is called baleen whales, which have no teeth in their mouths and only beards; The other is called toothed whale, which keeps its teeth in its mouth when it is not needed. Although there are not many kinds of baleen whales, they are huge and become the main hunting targets of human beings. There are blue whales with huge bodies, right whales with slow movements and generally large heads, humpback whales with short arms and funny movements, minke whales with small mouthparts and so on. There are many kinds of toothed whales, except sperm whales, the others are generally small, such as killer whales and dolphins. Although the whale's body varies in length and thickness, it is always streamlined and looks like a fish, so people call it a whale. However, whales are animals. It also like people, constantly surfaced to breathe air. Sometimes on the sea, we can see the white fog columns ejected by whales when they exhale, some of which are as high as ten meters, like fountains, which are very spectacular. Whale training

Whales are mammals that live in water all their lives. They are so dependent on water that they can't live without it. In order to adapt to life in water and reduce resistance, their hind limbs disappear and their forelimbs become paddles. The body becomes streamlined, like a fish. So their diving ability is very strong. Dolphins (small toothed whales) can dive to a depth of 1 00-300m and stay for 4-5 minutes, fin whales can stay underwater at a depth of 300-500m1hour, and sperm whales (the largest toothed whales) can dive below1000m and stay in the water for 2 hours. 1955, a sperm whale was found dead in the sea near Ecuador, and its diving depth reached1133m. A sperm whale was found entangled in a cable at a depth of 2200 meters near Lisbon, Portugal, which is the deepest record of mammal diving so far. 1969, a sperm whale was able to swim to the surface after diving 1: 52. After people killed it, they found a small shark in its stomach that had just been swallowed an hour ago. According to analysis, this shark only lives in the depth of 3 192 meters. It can be seen that sperm whales can dive to a depth of 3000 meters in the ocean.

Whale's self-report

I am a whale, and I am one year old. Everyone knows that we whales are the largest animals in the world, bigger and heavier than your elephants on land. At present, the largest known whale weighs about160,000 kg, and the smallest whale weighs 2,000 kg! We once found a whale weighing nearly 40,000 kilograms in China, about 17 meters long, with a tongue as heavy as a dozen big fat pigs. How heavy is my tongue? I don't know! Hehe, I worship my elders! We whales live in the ocean. Because our bodies are like fish, many people call us whales. In fact, we are not fish, but mammals. In very distant ancient times, our ancestors lived on land like their cattle and sheep ancestors. Later, the environment changed, and our ancestors lived in the shallow sea near the land. After a long time, their forelimbs and tails gradually became fins, and their hind limbs completely degenerated, which made us become what we are now and fully adapted to life in the ocean.

We have many kinds. Generally speaking, we can be divided into two categories: one is baleen whales without teeth; One is the toothed whale, which has sharp teeth. I am a small member of this baleen whale family.

Our bodies are so big, do you know what we eat? Don't worry, our baleen whale family mainly eats shrimp and small fish. When we swim in the ocean, we open our mouths, suck a lot of small fish and shrimp into our mouths together with seawater, then close our mouths, filter the seawater out of the whiskers and swallow the small fish and shrimp into our stomachs, so that we can eat more than 2,000 kilograms in one meal! Toothed whales mainly eat big fish and marine animals. When they meet big fish and marine animals, they will pounce on them fiercely, bite them with sharp teeth and eat them quickly. There is a killer whale called "the tiger in the sea". Dozens of whales often form a group and surround a fin whale weighing more than 30 tons. It was eaten up in a few hours, leaving no bones left.

This is outrageous! How can they eat members of our baleen whale family? Alas, we are not the "king of beasts" in the sea.

We whales breathe with our lungs like cattle and sheep, which also shows that we are not fish. Our nostrils grow on the top of our heads, and when we exhale, our nostrils will surface. The air from our nostrils forms a column of water, just like a fountain in the garden, which is beautiful. When our lungs are filled with air, we dive into the water. We must breathe regularly. Different kinds of whales have different water columns formed by the air they exhale: the water column of our baleen whales is vertical, thin and high; The water column of toothed whale is inclined, thick and short. Speaking of which, I can't help being a little proud! Because we are experts in making fountains. But this "fountain" can only be seen but not touched, because this water column is corrosive, and you humans will get skin diseases when you touch it.

We whales are viviparous, and young whales grow up by feeding on the mother whale's milk, which also proves that we are mammals. Fin whales are more than ten meters long and weigh 7000 kilograms at birth. It can grow 30 kg to 50 kg a day, and I will grow as big as my mother in two years. Our life span is very long, and we can even live to be a hundred years old.

Our reproductive ability is very poor, and we only have one calf every two years on average. Due to the killing of you humans and the pollution of the marine environment, our number is decreasing sharply. For example, nearly 360,000 blue whales were killed in the 20th century, and now there are less than 50 left. Many whale species that have lived on the earth for more than 50 million years are endangered. If this goes on, you may never see us again.

On behalf of our whale family and all our animal friends, I appeal to you humans: the world is our common home, let's live in harmony!

We are famous marine behemoths-whales. Although we look like fish, in fact, we belong to mammals like humans. Our whale family consists of two kinds of members, one is a baleen whale with no teeth in its mouth and the other is a toothed whale with sharp teeth in its mouth. I am a toothed whale and the overlord in the sea-killer whale.

Although I am small in the whale family, I am the bravest one. Fish, shrimp, even sharks and walruses in the sea will run away when they see me. My home is full of warmth. When my partner is injured, we will try our best to help, push it to the surface and accompany it to a safe place. My cousin, the blue whale, is the most burly animal in the whale family and the largest living animal in the world, bigger than some dinosaurs. It looks like a hill, more than 30 meters long and weighs 170 tons, which is 30 times heavier than the largest elephant on land!

We are full of treasures, and now we are on the verge of extinction due to overfishing. Alas! I really hope that human friends can treat us well. We like this beautiful and colorful world! Our brains are the largest and most complex of all animals on earth. We have a good memory and take care of each other in groups. For example, when we sleep, several partners always form a circle, with their heads inward and their tails outward to prevent other animals from sneaking up on us. Many people in my family are sea singers! For example, Moby Dick can make hundreds of sounds, and the changes of the sounds are amazing. It is a rare enjoyment to hear Moby Dick sing!

We are willing to live in harmony with our human friends, and we also hope that our human friends can give us space for free activities!

Although I look like a fish, I am not a fish, but a mammal. We whales are generally divided into two categories: one is baleen whales, which are very gentle and toothless; The other is the toothed whale, which has very sharp teeth. It only eats big fish and marine animals and never eats those small fish and shrimps. What about me? That cute baleen whale kid, eat small fish Shrimp.

My father is a killer whale, very fierce and has the reputation of "king of the sea"; Where's mom? She is recognized as a "beauty whale". She has a good voice and sings well. Every time we hold a singing contest, my mother will win the championship. Look! Mom is practicing songs there again!

Huh? There is a small fish fighting with a shrimp over there! I swam quickly, and the little fish was eaten by me. How about shrimp? Stuffed it into my stomach. Because I'm so hungry.

Oh! I forgot to tell you that when we breathe, we are different from other animals. Our nostrils grow on the top of our heads and float out of the sea as soon as we breathe. The spouted water is more beautiful than the fountain in the garden!

Another feature of our whales is that they sleep in a circle, with their heads inward and their tails outward. When they hear any sound, they will swim away immediately.

This is our family.

Hello everyone! I am a small whale, living in the ocean.

Almost all cetaceans: right whales, sperm whales, white whales, dolphins and other whales, have high economic value. Cutting the carcass of a razor whale can get 50 tons of whale meat, 30 tons of fat and 20 tons of bones.

The smallest cetacean is the river pig, which is closely related to dolphins and looks like dolphins. It is about 1.5 meters long and weighs about 50 kilograms. Like dolphins, river pigs often follow ships and pick up leftovers thrown into the water.

We have many brothers and sisters. Here are one or two.

Octopus is about 10 meter long and weighs 7 tons. It is the smallest baleen whale, with a population of about 200,000. Right whales are18m long and weigh about 20 tons. It is a sub-Antarctic species with a slender body, a black back and a gray abdomen.

Sperm whales, also known as true whales, are the largest toothed whales with a body length of 18 ~ 25m and a weight of 20 ~ 25t. Its body color is grayish yellow, and its head is particularly large and wedge-shaped, accounting for 1/3 of its body length. Its body is short, slow and clumsy, and it is easy to be killed. The existing inventory decreased from 850,000 to 430,000.

Hello, I'm a fat fin whale. My figure is very fat, and the fat is about 35-50 cm thick. But I don't know how thick it is, because I haven't measured it, and I can't measure it, because I have become a fish. I have to start with my ancestors: my ancestors lived on land like cattle and sheep. But later, due to the change of our living environment, our ancestors had to live in the shallow sea near the land. After a long time, we degenerated and our forelimbs and tails became fish. No wonder people call us whales.

Because we breathe with our lungs, we can't stay in the water for a long time. We have to breathe air on the water occasionally. When you exhale, the air in the hole above your head will take the water to the sky and form a column of water, which is very spectacular.

We are very big. Eight elephants haven't arrived yet. Although the whale trip is very heavy, our "boss" is very heavy, and a tongue can be as heavy as twenty big fat pigs. Awesome!

Our baleen whales are mainly eat small fish and shrimp. When swimming, we open our mouths, suck fish and shrimp into our mouths together with seawater, then discharge seawater from the channel and swallow the fish and shrimp. On the other hand, toothed whales eat big fish and marine animals, and sometimes they eat us. What a traitor.

We need to sleep, too. There are always several of us together. As long as there is any movement, we will spread out immediately.

I was viviparous, too. I grew up eating my mother's milk. When I was born, I weighed 6 or 7 kilograms. I can grow 50 kilograms a day and grow into a fat whale in two or three years. Our life span is very long. Generally, we can live for decades to a hundred years, sometimes for more than a hundred years, which is about the same size as a tortoise.

What's the matter? You know me.