1. An explanatory text introducing the crab

"Eight legs, a drum with a raised face, and two scissors to dance in front of the drum. It is born to be rampant and domineering, and often spits foam from its mouth." What is this? That’s right, it’s crab.

The crab is cyan in color and has a pair of flexible small eyes. As long as there is any movement next to it, its eyes will quickly retract. It has a pair of majestic large pliers, swinging randomly in the air, as if it can crush the hardest iron into a lump of mud with just one exertion.

Crabs like to walk sideways. This is because their pincers and feet are connected to the head and chest and cannot bend freely, and the joints of the feet can only bend downward and move left and right, so they can only move to one side. The crab has a very hard shell that protects it from damage, but when the crab grows up, its shell does not grow with its body, so after a while the crab has to take off its old shell, and it The body will continue to grow.

There are generally two ways to eat crabs: steamed or spicy. The steamed crabs are very tender and have an indescribable fragrance. You can eat them with some light soy sauce. The spicy ones are different, very crispy and a little spicy.

After listening to my introduction, you must have a new understanding of crabs, right?

2. Who can give me an explanatory essay on "Introducing Crabs"

Crab is the common name for crab. Also known as "crab clam".

Crabs are crustaceans whose bodies are protected by hard shells. In terms of biological taxonomy, crabs, shrimps, lobsters, and hermit crabs are the same kind of animals. Most types of crabs live in or near the sea, although some live in fresh water or on land.

Crabs breathe through gills.

Common crabs include hairy crabs (commonly known as river crabs, hairy crabs) hairy crabs, blue crabs, and swimming crabs.

They rely on female crabs to give birth to small crabs. Each time the female crab will lay a lot of eggs, The quantity can reach millions or more. After these eggs hatch in the abdomen of the mother crab, the larvae can break away from the mother and float around with the coastal currents. After several shellings, they grow into big-eyed larvae. The big-eyed larvaes grow into young crabs after several shellings. The appearance of the young crabs is almost the same as that of adult crabs. After several more shellings, they turn into crabs. Most saltwater crabs discharge their eggs directly into the ocean without hatching after their eggs mature.

The hard carapace on the crab can protect the crab from natural enemies, but the carapace does not expand as the body grows. Therefore, the growth of crabs is episodic, that is, after a period of time, the body will continue to grow after the old shell is shed. The largest crabs on earth are spider crabs, with their legs spread up to 3.7 meters wide. The smallest crabs are bean crabs, less than half a centimeter in diameter.

Although crabs are small, they have all the internal organs. After removing the hard shell of the crab, we can find that the crab's body is protected by a shell. These shield-like shells are called carapace by biologists. The body of the crab is symmetrical and can be divided into the forehead area, eye area, heart area, liver area, stomach area, intestine area and gill area. The two sides of the crab's body are connected by appendages. The appendages on the head are called antennae, which provide touch and smell functions. Some appendages have mouth functions, which are used to tear food apart and bring it into the mouth.

There are five pairs of appendages in the crab's chest, called thorapods. The pair of appendages in the front are equipped with strong claws, which can be used for foraging. The remaining four pairs of appendages are the crab's feet. Crabs rely on these four pairs of appendages to move and move. Their walking appearance is unique. And interestingly, most of them are walking sideways instead of going straight forward. The exception is monk crabs, which walk straight.

Crabs spend most of their time looking for food. They are not picky eaters and will eat anything their pincers can get. Small fish and shrimp are their favorite, but some crabs eat seaweed and even animal carcasses or plants.

Crabs eat other animals, and other animals may also eat crabs. For example, humans treat crabs as delicacies. There are also waterfowl that eat crabs! Some fish also like to eat crab legs just like humans. When young and immature crabs float in groups in the sea, they may be gobbled up by other marine life. Therefore, crabs must lay many eggs when they spawn.

Fiddler crabs are common crabs on the beach. Why are they called fiddler crabs? Because these crabs wave their large claws as if they are waving at the tide, this is how the name "tide fiddler" comes from. In addition, the giant claws of the male fiddler crab look like playing a violin, so they are also called fiddler crabs or violinist crabs. 3. A 450-word essay about crabs

Crabs

Eight legs , Raising the face drum, dancing in front of the two scissors drum, born to be rampant and domineering, singing and spitting out foam. (Hit an animal), congratulations, you got the answer right! It's a crab. Today, I made an observation about it.

The crab looks like an enlarged spider, except that it has two more legs than the spider. It wears a set of yellow-brown armor all over its body to avoid natural enemies and defend itself. There are four legs on each side of the oblate body, and each leg has four sections.

There is also a pair of eye-catching clamps on the front. The two guys are like big iron pliers. They are good guys for offense and self-defense. They are also a must-have weapon for home travel. There is also a pair of small soybean-sized clamps on the armor. The eyes are slippery. Turn the crab over and look at the abdomen. There is still a squeeze, the male is pointed and the female is round.

In addition, crabs have three major characteristics in their living habits.

First, the crabs move sideways, spitting bubbles as they crawl. Don't look at their body being smaller than my hand. In fact, it climbs up like a wild horse and disappears in the blink of an eye.

The second is that it is very ferocious. It does not rest for a moment, especially when it is eating, it is even more ferocious and unusual. It eats with big mouthfuls, as if someone is trying to compete with it. If you touch its back at this time, it will definitely clamp you tightly and you will not be able to shake it off no matter how hard you shake it.

Third, it is very resistant to hunger and will not starve to death for ten days and a half. I remember that during the Spring Festival, our family of three went home to celebrate New Year's Eve. A week later, we returned home, thinking that the crab was dead, and were ready to "collect" its body. But who would have thought that after entering the door, the crab was safe and sound, sitting there leisurely. Waving its tongs and doing morning exercises, how resistant it is to hunger!

These are my crabs, one male and one female! 4. A 600-word essay on crabs

Yesterday, my grandma bought four crabs from the market. I caught them one by one and put them into a glass jar for observation. The crabs have a pair of clever little eyes. It can spin around like an electric fan, with eight domineering legs and a shell "carrying" on its body, which looks extremely solid. They are shaking two large pliers in the jar, waving them around at will, listening to the "click, click," The sound of "click" sounds majestic. The air is like a general. Crabs are very aggressive. You see, they wave their eight legs and walk forward. When they come in front of each other, they raise their big pincers to push against each other. Yes. After playing for a while, they calmed down again and started playing games. They arranged for a crab to squat in the center, and then other companions jumped over from its back. The smaller crab was a little scared, afraid of falling or being stepped on. His companion. Under the urging of his companion, he spit out the foam, jumped over with a heartbeat, and fell "on his back". After they finished playing the game, they started fighting again. Their eyes stared at each other. , and then turned the opponent over hard. The winning crab was of course very proud, waving its pincers around and showing off. I thought to myself: Have the crabs also watched too many kung fu movies starring "Jackie Chan"? Crabs also like to "stack", climbing on the back of another one and stacking them up layer by layer. What's even more interesting is that the crab climbing on the top is stepping on the shell of the crab under it with its feet, while using its big The pliers are hooked on the edge of the jar. It looks like it wants to escape! I hurriedly flicked it with a ballpoint pen, and the "Arhats" turned over, and they scattered again... After getting up this morning, I found that there was a crab missing from the jar. I guessed that it escaped by "stacking Arhats", so I quickly looked around After searching, I found it hiding quietly under the table. I carefully threw this "deserter" into the jar and covered it with a cardboard box, so I felt relieved. If you are not careful, it may give you a bite and call you. You can't get rid of it. This crab is not only aggressive, but also a bit cunning. 5. Explanatory essay on crabs

Speaking of eating hairy crabs, it is definitely a seasonal enjoyment. Li Bai, a poet of the Tang Dynasty, once praised: "The claws of crabs are gold liquid, and the hills are Penglai."

You must drink fine wine and ride on the moon to get drunk on the high platform." It is understood that the price of hairy crabs this year is slightly lower than last year. How can gourmets miss this good opportunity to feast? As the saying goes: "When the autumn wind blows, crab legs are itchy. In September, the navel is round and pointed in October."

The "round" and "point" refer to the crab navel (bottom), and the navel of female crabs is round. They are shaped with alternating horizontal stripes. Female crabs should be eaten in September, when the roe is full and the flesh is thick; male crabs should be eaten in October, when the navel is pointed and the flesh is firm. So, what is the best way to eat hairy crabs? What’s the point of choosing hairy crabs? Let us answer them for you.

Various ways to eat hairy crabs Steamed hairy crabs This is the most classic way to cook hairy crabs. This method mainly highlights the original flavor of the crabs and can maintain the color, aroma and taste of the hairy crabs to the maximum extent. The waiter at Zhujiang Chun Hotel brought the steamed crabs to the table. The hairy crabs were orange in color and the meat was fresh and sweet.

Open the bottom cover and peel off the back of the crab as well. The golden paste in the crab's back will be revealed in front of you. Carefully peel off the paste, pour vinegar on it, and put it in your mouth. , taste it carefully and chew it slowly, it is indeed "crab meat with a hundred flavors". Fried Crab with Salt and Pepper This dish goes well with wine.

Cut the fresh crab into pieces, soak it with green onion, ginger and cooking wine for a few minutes, fry it in oil until golden brown, then add tofu, ginger, green onion, salt, soy sauce, etc. to simmer it out. . The best wine to pair with this dish is rice wine, and among the rice wines, Huadiao is the best.

You can also enjoy the modern hairy crab with a glass of cold beer. Mustard greens soaked in crab soup. First use hairy crabs to make soup, and then dip this local characteristic seasonal vegetable into the crab soup. The crispy mustard greens also have a umami flavor.

This method is relatively light, and it is perfect after trying the previous types of hairy crabs. Huaiyang Crab Rice Rice is covered with a layer of orange-red crab roe, which contrasts with the orange-red crab and looks very attractive.

Pick out the crab meat and crab paste, add chopped green onion, and mix well with crab roe and rice. The hot rice is tinged with orange color, and when chewed carefully, every grain of rice is filled with a faint scent of crab.

The chef said that to steam crabs, it is best to put the crabs in the refrigerator for half an hour to quickly freeze them, so that the crabs will not move around during steaming and the crab roe will not fall apart after steaming. But when making Huaiyang crab rice, it is necessary to let the crabs move. Steam the crabs and rice together to let the crab juice seep into the rice.

Dried crab fins with meat powder This delicacy is made with hairy crabs and golden hook fins. The orange-red crab roe, white and tender crab meat, and translucent shark fins are the best in color, aroma, and taste. They have a unique flavor and look great.

The red and yellow, full golden color reveals an attractive umami flavor. Take a bite and you will find that the crab and wings are "fishy and fishy", and the rich fragrance reaches directly to the internal organs. At this time, the excellent chicken soup prepared from Dongjiang's secret recipe is added. The fragrance and tenderness of the three delicacies make people want to add another portion.

Yipin Crab Buns This is Dong Xingshun’s signature snack. The surface of the crab buns is dotted with orange crab roes, which are shiny and shiny, like flower stamens. When I couldn't wait to pick up a piece and put it into my mouth, the meat of the hairy crab was mixed with the aroma of crab paste, crab roe, and squid gum. It was very delicious.

Medicinal Hairy Crabs Hubei, known as the "Province of Thousand Lakes", has been a famous "Land of Fish and Rice" in the Yangtze River Basin since ancient times. The hairy crabs produced here are tender in texture, and their quality is generally measured in terms of size. The best hairy crabs are two or so, slightly smaller than those from Yangcheng Lake. At the Seaweed Moss Restaurant, the reporter discovered this type of hairy crab that was specially flown to Yangcheng from Hubei.

The hairy crabs cooked in Hubei are very spicy and you can already feel the spiciness without using chopsticks. Open the shell of the hairy crab with force, use a small spoon to gently pour the golden crab paste into the tip of your tongue, and you will feel the refreshing taste directly into your throat. Since this river fresh hairy crab is based on the preparation method of spicy crab, it tastes very good. Fragrant.

Yellow Wine Frozen Drunken Crab This is made by soaking hairy crabs in rice wine. The aroma of the wine complements the umami taste of the crab. To eat drunken crab, two important ingredients are indispensable - ginger tea and vinegar.

Because hairy crabs tend to be cold, ginger tea is usually used to warm the stomach after eating. When eating crabs, you have to pay attention to the order of the various parts. The crab shell should be eaten last, because the essence of crab paste is in the shell. If you eat it first and then taste the meat of the crab legs, its deliciousness will be greatly reduced, so Save the best for last.

After seeing so many cooking methods, are you planning to give it a try? Don’t worry, whether you can buy fresh crabs with delicious meat is a crucial step~ Please see the next page (five things to look for when choosing hairy crabs): Five things to look for when choosing hairy crabs: The crab shells are bright, shiny, and Dark green ones are generally thick and solid; yellow ones are mostly thin; it is better to choose "golden retrievers and golden claws". If you look at the belly button, if it protrudes, it is usually full of fat; if it is sunken, it usually means lack of fat.

When you hold the crab with your hands, you still have to feel it is "heavy", so you choose the hairy crab that is plump and creamy with rich crab meat. If you look at the crab's feet, the claws are strong and the "feet hair" on the crab's feet is clustered, which means that the crab's feet are usually fat and old; those that are hairless are mostly soft and have no fat.

As the saying goes: "Select female crabs in the eighth month of the lunar calendar, and male crabs after September." Because the gonads of male crabs mature well after the ninth month of the lunar calendar, the taste and nutrition are the best.

Generally, those with round navels are female crabs, and those with pointed navels are male crabs. Turn the crab over based on its vitality. If it can be quickly flipped back with the crab's legs, it means it has strong vitality; if it cannot be turned over, it has poor vitality and cannot be stored for a long time.

It can also be observed by its "horizontal movement". Those whose belly is lifted off the ground when crawling are good animals. Of course, the crab legs are all tied up, so that's not included.

However, you can also check whether the crab is responsive. If you touch the side of its eyes with your hands or branches, the eyes will flash flexibly and the response is quick, or it will "squirt white bubbles from the mouth", it is still enough. Vibrant and fresh. Four things to eliminate when eating hairy crabs: When eating hairy crabs, the following four things contain a lot of bacteria and dirt and must be eliminated.

Except for the gills, which are shaped like eyebrows and arranged in strips on both sides of the crab body; except for the stomach, which is located in the front half of the crab bone, closely connected to the crab roe, and is shaped like a triangular packet; except for the heart, which is located on the roe or crab roe. In the middle of the oil, it is closely connected to the stomach and is hexagonal in shape, making it difficult to identify; except for the intestines, it is located in the middle of the crab navel and is in the shape of a strip. Answer (2) There are many ways to eat hairy crabs.

Compared with the popularity of spicy crabs, steamed hairy crabs can be said to have been in the world for a long time and have never declined. Because most people taste crabs for their deliciousness. 6. Crab composition

There is a stream not far from my home, and there are crabs hidden under the rocks at the bottom of the stream.

When there was no homework, my classmates and I went to the creek to catch crabs. I opened a large pebble and saw a nest of crabs of various sizes, scurrying sideways and escaping in all directions.

However, the dark brown "iron armor" supported by eight legs looks a bit stupid. I stretched out my hands and caught the biggest one among them. Unfortunately, this crab waved its big pincers and pinched my palm hard.

I endured the pain and quickly threw it into an empty tube I brought.

When I got home, I put them in a rectangular glass jar and observed them several times every day after school.

The crab carries a large hard shell on its back. There are several almost invisible white patterns in the center of the shell. I took a closer look, ha! It looks like the kind face of an old man.

There are three small prongs protruding from both sides of the shell, just like the small flags on the backs of military commanders in Peking Opera, which looks so majestic. Under the big shell, in addition to one thigh protruding from each side, there are also four calves extending from each side. Each calf is folded in four, and the last fold is like a small iron hook.

The crab's big clamps are really powerful. The two clamps are open like two vices. There are a row of small, sharp, dog-like teeth on the top and bottom of the "jaws", and there are black hairs on the big clamp! Crabs are very aggressive. They are in the glass tank, dancing with their big pincers, rising and falling in the water, majestic.

That look did not look like a "prisoner" locked in a vat, but rather like a victorious general. They seemed unwilling to be left alone, and the two crabs actually started fighting.

Before the "battle" began, they pushed towards each other fiercely with their round eyes bulging. When they encounter each other, they use pliers to clamp them, kicking and kicking with their eight feet. The small door-like mouth spits out strings of white foam, advancing and retreating, up and down, and fighting fiercely.

The larger crab used its pincers and carapace to push against the other crab. The overturned crab had its belly turned upside down, and several legs were "catching" on it. It danced its large pliers feebly before it finally turned over and rushed towards the big crab again: The more I looked at it, the more interesting it became. I thought: Are they also learning to "fight and compete"? Crabs are so energetic! Usually, it runs rampant in the fish tank, and the small fish in the fish tank never play with it, but always stay away.

It often made the cobblestones inside roll around, and once I mistakenly thought it was someone knocking on the door! When the crab has nothing to do, it will use its powerful claws to grab the fish tank. It may want to break the fish tank and escape! Crabs bring me endless joy, I really love them. 7. Cute Little Crab Composition

[Cute Little Crab Composition] Cute Little Crab This Sunday, I was at my grandma’s house. Cute Little Crab Composition. It was a sunny morning. I was riding a bicycle with my friends. Xie Lei came to a very shallow stream. I saw a small crab on the water's edge and said, "Xie Lei, can you help me catch it?" He agreed, took off his shoes and went down, and he caught it as soon as he saw it. I was very happy to see him. We rode our bicycles home. When we got home, my father had already driven to pick me up. I put down the bicycle and picked me up. I bought two plastic bags, filled some water with them, put the little crab in them and took the car home. When I got home, I put it in a useless goldfish bowl, packed my schoolbag and went to school. Before going to school, I told my mother: "Mom, you have to feed the little crab and change the water." The back of my little crab is brown and the belly is white. It is a male. I will go there next time. I caught a female at my grandma's house. When I got home on Friday, according to my previous habit, I would sit in front of the TV. But this time it was completely different. Instead, I went to the goldfish tank to see the little crabs. I came to the fish tank. When I saw that there were no little crabs, I found my mother. My mother told me one by one. The little crabs tried to run away many times, but my mother "carried" them back. I looked around, still chanting: "Little crabs." Crab, you are here.

Finally I found it in the corner of a table and caught it in the fish tank. This is my cute little crab that wanted to escape many times. Cute little crab composition 400-word essay for primary school students (/). 8. Expository essay about crabs, first grade level

I went back to my hometown a few days ago. There was a stream behind the village, and there was always one hidden under the rocks at the bottom of the stream. Only a crab.

My sister and I happily went to catch crabs. The water in the creek was so clear that we could see the rocks at the bottom.

I lifted up a big stone and saw one. The large and small crabs in their nests scattered in panic and fled around. Although they were very capable of running away, the dark-brown "iron armor" on their backs seemed a bit clumsy. I took the small wooden stick next to me and held it empty. The jar was half filled with water, and I threw the crabs into it, and I caught eight of them in a short time.

Through observation over the past few days, I found that the crabs were very aggressive, and one of them was very aggressive. The crab was not stable for a moment in the empty wine jar. It waved its big pincers up and down in the water, majestic and majestic. It was not like a "prisoner" in a "cell", but like a triumphant returner. "General".

It was so cute that it provoked trouble, and the other one was not to be outdone, and a decisive battle began, and the two crabs were bulging. Eyes, approaching the opponent fiercely

As soon as it comes into contact, it will be clamped with pliers, its eight feet will kick and kick, and the small door-like mouth will spit out strings of white foam, advancing and retreating. The fight was fierce. The bigger crab used its claws and carapace to push against the other crab.

The overturned crab's belly was in the air, and its eight claws were scratching in the water. ", waving the big pliers constantly, I turned it over with a small wooden stick, and saw it attacking the big crab again. Are they practicing "boxing"? They were snoring and staring just now, but they made up after a while. La.

Sometimes, they stay in one place alone and don't touch anyone; sometimes, the trouble-seeking crab will move this and that, causing a fight.

Look! What an interesting crab! You should also raise a few and observe them! Or this? Many people will never forget the deliciousness of crabs after eating them. However, please note that dead crabs are poisonous and may cause food poisoning if eaten accidentally. In autumn, my mother said to me: "Ju-flavored crab fat is the best time for people to taste crabs."

Crabs, with tender meat and delicious taste, are valuable aquatic products. "Crabs are also very rich in nutrients. The protein content is several times higher than that of pork and fish. The content of calcium, phosphorus and vitamin A is also higher.

Autumn crabs are delicious and nutritious, but if you eat If done improperly, it may cause health damage! "Eating steamed crab is the safest! Because crabs grow in rivers and lakes and like to eat small organisms, aquatic plants and rotten animals, the crab's body surface, gills and gastrointestinal tract are full of pathogenic microorganisms such as bacteria and viruses. If you eat crabs raw, pickled or drunk, you may be infected with a chronic parasitic disease called paragonimiasis.

Therefore, I advise everyone to eat boiled crabs. We still have a question - why do crabs walk sideways? 1. Earth’s magnetic field theory Crabs rely on the earth’s magnetic field to determine direction.

In the long years since the formation of the Earth, the magnetic north and south poles have reversed many times. The reversal of the geomagnetic poles disorients many organisms and even causes extinction.

Crab is an ancient migratory animal. Its inner ear has small directional magnets and is very sensitive to geomagnetism. Due to the reversal of the geomagnetic field, the small magnets in the crab's body lose their original orientation.

In order to survive the reversal of the geomagnetic field, crabs adopt the approach of "keeping constant in response to all changes". They simply do not move forward or backward, but walk sideways. 2. Biological perspective: The head and thorax of a crab are indistinguishable in appearance, so they are called cephalothorax.

The full legs of this animal grow on both sides of the body. The first pair of chelicerae is not only a tool for digging holes, but also a weapon for defense and offense.

The remaining four pairs are used for walking and are called walking legs. Each foot is made up of seven joints, and the joints can only move up and down.

The width of the thorax of most crabs is greater than the length. Therefore, when crawling, they can only bend one of their legs and grab the ground with their toes. When it hits the ground, it begins to contract, and the originally bent foot immediately straightens, pushing the body to the opposite side. Since the lengths of these pairs of legs are different, the crab actually moves sideways and forward.

However, not all crabs can only run wild. For example, long-armed monk crabs that live in groups on the beach can run forward.

Many spider crabs that live in seaweed can also climb vertically on the seaweed. Crabs spend most of their time looking for food. They are not picky eaters and will eat anything within their reach.

Small fish and shrimp are their favorite, but some crabs eat seaweed, and even animal carcasses or plants. Crabs eat other animals, and other animals may also eat crabs. For example, humans treat crabs as delicacies.

There are also water birds that eat crabs! Some fish also like to eat crab legs just like humans. When young and immature crabs float in groups in the sea, they may be gobbled up by other marine life. Therefore, crabs must lay many eggs when they spawn.

Fiddler crabs are common crabs on the beach. Why are they called fiddler crabs? Because these crabs wave their large claws as if they are waving at the tide, this is how the name "tide fiddler" comes from. In addition, the giant claws of the male fiddler crab look like playing a violin, so they are also called fiddler crabs or fiddler crabs.