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My observation composition is 400 words.
No matter in school or in society, many people have had the experience of writing and are familiar with it. According to the different writing time limit, writing can be divided into limited writing and unrestricted writing. How to write a thoughtful and literary composition? The following is a 400-word observation composition I compiled for you, which is for reference only and I hope it will help you.

My observation composition is 400 words, 1, and the world is full of wonders. Recently, I have observed another magical phenomenon. Let's share it.

One night in the summer vacation, I found a strange bug on a osmanthus tree downstairs in my grandfather's house. It is as ugly as an alien creature, with a black, protruding body and hooked feet. Needless to say, as we all know, it is a cicada larva.

Out of curiosity, I took it home and put it on a pot of chlorophytum. It stayed on a leaf, motionless, and I stared at it. Suddenly, I heard a slight sound, like a fly hitting the glass. "bang!" The cicada larva's soil back is cracked! Slowly, the tender, blue upper body hangs upside down, and a little bit of transparent, blue wings curl up at both sides of the body, like a little girl who doesn't want to unfold a beautiful skirt and show her beautiful face like a flower.

After about twenty minutes, the cicada's front foot began to struggle for a few seconds. Miraculously, the cicada's whole body came out of its shell. It took the shell, turned around and showed its face. How black its eyes are! The yellow-green body is completely new, which makes people shine. Slowly, the cicada unfolded its "long skirt" (wings). Oh, it turned out to be a princess dress, with a transparent middle and a layer of green "lace" outside! It's beautiful! It gently shook the skirt, which shone in the light. Ah, what a beautiful elf this is!

An hour later, the cicada still stopped on the cicada slough, and my mother urged me to sleep. Lying in bed, I seem to see cicadas flapping their wings, flying high from the chlorophytum, flying out of the window and flying to its new life.

My observation composition is 400 words. The annual National Day has arrived. I was so excited that I boarded the plane back home with my father. This plane is very exquisite. It's Airbus A3 19.

A3 19 is a medium-sized aircraft with a flying speed of about 850 km/h and a maximum flying altitude of about 12,000 km. A3 19 is divided into three cabins, 8 first class, 24 business class and 90 economy class. * * * It can accommodate 122 passengers, including 2 rows of first class with 4 seats in each row. Business class is ranked from 3 1 to row 34, and row 35 is economy class. A3 19 is a single-aisle aircraft. The seat numbers are ABC and JKL. A and I are near the window. I like it best. I can sit by the window and enjoy the beautiful scenery outside.

The facilities in A3 19 engine room are exquisite and complete, including luggage rack, toilet, air conditioner, LCD TV, lighting lamp, LED reading lamp ... The air conditioner outlet is exquisite and concealed, and installed above the seat and window. I think the design of A3 19 air conditioner is clever and cool, sometimes it is so cold that people cry for help.

There are three super-bright LED reading lights above the seat. This device can make people read comfortably without affecting the people nearby.

A small LCD TV will be installed every four rows of seats on the plane. It can educate guests about safety and let people know how to escape. It can play movies or TV series for you when flying flat. The service on A3 19 is also very thoughtful. Sprite, cola, tea, Wang Lao Ji, coffee, etc. Will be sent during the flight. The taste of the drink is quite sweet, and I can't help but want to drink it one mouthful.

I think A3 19 is an Airbus, with ingenious design, gorgeous decoration and thoughtful service. I like it very much. I want to say I love you to A3 19.

My observation composition 400 words 3 autumn, the happiest thing is to eat all kinds of fruits, my grandfather and I like to eat persimmons in the market. At this time of year, grandpa will buy many immature persimmons from Yongjia and eat them slowly at home.

I took an unripe persimmon to observe. I find persimmon is heavy in my hand. Squeeze hard and immature persimmons like stones. Its color is orange. I heard that persimmons placed next to apples will speed up the pace of maturity! At this time, a very funny idea suddenly appeared in my mind: I want to give two persimmons a relatively mature competition. So I took an apple and two persimmons. One persimmon and an apple were put in the same box, and the other persimmon was put in another box alone. I am secretly happy.

Two days passed, and I couldn't wait to open the box containing apples. "My God!" I was shocked. "Persimmons really turn red!" I quickly pinched the persimmon with my hand, and the persimmon was much softer. I opened another box without apples and found that the persimmons in it had not changed much, so I built two more boxes.

Four days later, when I opened the two boxes again, I was both happy and unhappy. I'm glad that the persimmon is ripe, but I'm not happy that the persimmon put together with the apple actually has many "wrinkles". It turns out that persimmons, like people, wrinkle when they get old.

Observing persimmons is so interesting! This observation also let me know: as long as you find it with your heart, you will know the little secrets of many things.

When I came back from my grandmother's house in the afternoon, I suddenly found that the "red crown" was not red. Its crown turned white and became bigger, like a cluster of corals, but I felt its head was blown up and suddenly became bigger. What happened? I asked my mother, and she said it was the first time to see it. Let me find the answer myself.

This is not recorded in my encyclopedia. It seems that you have to find the answer on your own. I went back to the "Red Crown" and saw that it was not as active as before, swimming slowly and occasionally lazily spitting bubbles. Even the "black cloak" came to peck it, and the "red crown" was indifferent and let it bully. Hey! Poor "Red Crown" must be sick! What shall we do? "Yes, please ask my classmate Seaking for help." "Seaking" said to come and help me have a look tomorrow. I put down the receiver and silently prayed that "Red Crown" could spend the night safely. 654381it's cloudy on Thursday, October 3rd.

Wake up in the morning and go to see the "Red Crown". Ah! What I was worried about finally happened-"Red Crown" was lying on its side, floating motionless on the water ... I stood silently, blaming myself for staying at my grandmother's house for too many days, and regretted not letting "Seaking" come over last night.

"Seaking" told me that "Red Crown" died of infection, and the water quality had a great influence on the health of goldfish. If you raise goldfish with tap water, you need to give them sunshine. I want to learn the lesson of the red crown and raise the "black cloak".

My observation composition 400 words 5 Once I went back to my hometown, I ran out to see the bees and found a bumblebee. I told him that it wouldn't take bees as prey, but it caught one and ate it quickly, as if someone was fighting for it. As soon as I saw it, I screamed. It flew away as soon as I called. At this moment, grandpa called me and asked me what was wrong. I said, "A bumblebee ate your bee and ran away as soon as I called it." Grandpa said to me, "I know, there are many bumblebees here. They eat a lot of my bees." Peng Yu, go and play. It hurts to be picked up by a wasp. It is too dangerous. "

So grandpa stayed by the beehive, holding a net cover and waiting for the bumblebee to come back and steal bees. Soon, the greedy bumblebee flew back. Grandpa built it. The bumblebee was built by the defendant. Then I hit the bumblebee several times with a broom, but I couldn't fly. Because bumblebees keep eating worker bees, which reduces the honey production, bumblebees are natural enemies of bees. So I wanted to observe what the bumblebee has in common with other bees, and make it a strong bee, so I took its body back to my room for observation.

After observation, I found several characteristics of bumblebee: the body is twice as big as other bees, and other bees can't beat bumblebee naturally. Clairvoyant, easy to find and attack prey. A big mouth makes it more convenient to eat. Eat meat to replenish protein in the body and make the body fat and powerful. Abdominal large needle bend is highly toxic, and the poisonous needle can be used repeatedly, which has a greater chance of survival. I told grandpa the characteristics of these bumblebees and told him to be more careful.

After this observation, I know that the same animal is different in a certain way!

My observation composition is 400 words and 6 words. According to my mother, when I was a child, I liked watching ants move things. Every time I watch ants carry things on their backs, I always watch them for a long time, and I always feel very funny.

Look, today, ants eating bread crumbs still arouses my curiosity.

When I was eating bread in the morning, I accidentally dropped a small piece of bread on the ground. An ant touched it and left in a hurry. I thought, "What did it do, inform its partners and share delicious food together?" When I looked at the bread crumbs again, I found some ants coming, so I decided to have a look.

I looked down at these ants again. Like the first ant, I touched them and hurried away. I followed them. Suddenly, the ants met their companions and stopped. The ants also turned and left. The ant hole arrived, so many ants made me confused which ones were just stared at, so I had to go back to the original place.

Ah! Bread crumbs have been surrounded by ants and bumped around. It seems that there are not enough hands and there is no way to start. Hey! There are many more, and they are neatly arranged. At first glance, they really come from caves.

Fengfeng, Fengfeng, what are you doing? Mom called me. I asked casually, "Mom, can ants communicate?" "Yes, of course, it uses its tentacles to spread news." Mom said.

After listening to my mother's words, I understood that the first ant must have told the ants behind, and they sent messages to each other, and finally a team came.

Look! A big piece of bread crumbs was carried home by a small ant.

My observation composition 400 words 7 How do mung beans germinate? What is the secret? I didn't know anything about these before, but I just guessed at random, but from now on, I will carefully observe mung beans day by day until the tenth day.

I carefully selected ten mung beans, and it took me a long time to find ten "elites". I found a disposable cups, took some water, put mung beans in it, and planted mung beans. I'm ready to have a good meal and see what happens to them. I had a good meal, so I came to have a look. There are three beans with wrinkled skin. I rated them as "three good mung beans". They are my pride!

Every day, I fantasize that beans grow up day by day, the longer and thicker the buds are, and finally "gloriously" they become bean sprouts. Until the fifth day, the fantasy came true and the beans were renamed bean sprouts. Its buds are thin and long, and the twists and turns are white. The bud becomes a stem, and the stem grows whiskers with many roots, like bean sprouts thousands of feet long.

In these ten days, there are the happiest things and the saddest things. The happiest thing is to find that two scissors-like buds spit out from the middle of the beans and are folded by a bigger bud. Later, I found that these buds are not buds, but leaves, which slowly open to both sides to form a "one" and support the beans below with a small umbrella. The saddest thing is that one of the bean sprouts died. I carefully wrapped it in cloth, drew a love on the cloth and buried it in the soil.

Bean sprouts are like my friends. Whenever I am unhappy, it seems to talk to me. When I saw it, I forgot the unhappy things. Like Santa Claus in my heart, he brought me many gifts-happy surprises.

My observation composition 400 words 8 One of the small animals I observe is a dog. The dog has a pair of sharp eyes the size of a glass ball, a pair of lovely triangular ears, a small nose like chocolate and a mouth with many sharp teeth in Zhang greatly, which seems to bite all its prey into pieces. The dog's tongue has heat dissipation function, so it won't get hot. It is covered with hair, and those hairs cover it like a quilt, so that it won't catch cold. There are many kinds of dogs, such as shepherd dogs to protect sheep and German shepherd dogs used in rescue work.

Dogs can bring many benefits to people, such as looking after the house, finding lost things and saving people. Dogs are characterized by a keen sense of smell, ears and eyes. They can see everything at night, and their mouths can swallow something hard. In my opinion, dogs are the most loyal friends of human beings. Please don't kill the puppy. It's best to get along with dogs and treat them like people. This is an animal and my view.

Teacher's comment: Through careful observation, the author described the various characteristics of the puppy in detail, and drew an exquisite portrait for the puppy by using figurative rhetoric. The article has clear structure, distinct levels, detailed description and smooth expression, which fully shows the image of the puppy. "Make it not too hot" was changed to "Make it not too hot". "Better be friendly with dogs" was changed to "Better be friendly with dogs". "This is an animal and my view" was changed to "This is an animal and my view".

On Saturday, my parents and I went to Zhongshan Square to observe the little white dove.

A flock of white pigeons often fly to the square from a distance. I usually just watch from a distance. I'm going to observe it carefully this time. When I arrived at the square, I ran to the pigeons and found that their pointed mouths were pink and their red eyes were spinning around. I gently stroked the pigeon with my hand and felt its body warm. Its white feathers are fluffy and soft, like a folded feather fan. The paws of the little dove are covered with fine crimson scales, and each fingertip has a small hook. At this time, my mother bought me two packs of pigeon food. I can't wait to grab the grain and feed it to them. I asked my parents curiously, "Why are pigeon eyes red?" Where does the cooing sound come from? How do they deliver letters? "Dad said," son, you observe very carefully. Let's go home and check the information to find the answer! " "

It's almost evening, and the pigeons are flying back to their nests with the whistle of the breeder. I went home and checked the relevant information. It turns out that the red eyes of pigeons are called iris and veil, and different kinds of pigeon veils are different. Goo-goo sound is the sound made by air vibration sounder in its respiratory tract. Pigeons have the ability to deliver letters because of their strong homing. Pigeons navigate through their internal biological clocks, the position of the sun and the geomagnetic field.

Pigeons brought me happiness this afternoon. I found that each small animal has its own unique appearance and living habits. I want to observe more lovely animals with my eyes.

My observation composition of 400 words 10 is naturally wonderful. As long as you observe carefully, you will find something.

One Saturday morning, my father took me to the botanical garden to play. As soon as I entered the gate of the botanical garden, there was a smell of trees. When we walked in, we saw many bugs flying. Is it going to rain?

After we went to the "Stone Lawn Garden", the weather seemed a little wet, the fallen leaves stuck to the path one after another, and the stones were covered with green moss. Nothing else, but the weather is a little stuffy.

I want to stay a little longer. I looked at the tree casually, and found a shadow flash across, fell to the ground and was eaten by a bird.

"It turns out that birds catch bugs!" I looked at it carefully. That's a swallow. Looking at it, I feel very strange: why does he catch bugs? When will it rain? I remembered the last time. It was the swallow that caught the bug, but it didn't fly that low! "Oh, it was a sunny day!"

When I get home, the first thing I have to do is to check the reason online. It turns out that as long as the air is humid, the wings of insects will be stained with water vapor, which will increase the pressure and make them fly low. Therefore, it is also a sign that swallows catch insects before it rains.

I don't want to mention how happy I am to know why swallows fly low before it rains!

Nature is wonderful, as long as you observe it carefully, you will find something, just like me!

My observation composition is 400 words 1 1. I like kittens. I have been accompanying and taking care of them since I was a child, because they are my best partners.

My kitten is very cute. It has a chubby body with thick furry hair outside. It looks like the eyes of a black pearl. Kittens are not only cute, but also smart. Every time there is movement, the kitten will take the opportunity to jump over.

Today, my mother bought some fur balls. My kitten saw them and cried happily, as if to say, "Ah, there are fluffy balls to play with again." Suddenly, my mother shouted and said, "No!" When I saw it, oh, it turned out that the kitten had stolen the fur ball and was playing acrobatics! I saw the kitten grab it with its front paws, tightly plug it with its whole body, and then push it back hard with its hind feet. At the same time, her clever eyes looked around warily for fear that someone would take it away. ...

The next morning, when I got up early to go to the toilet, I found the kitten playing happily in the hall. I think the kitten may have been infected by the fur ball and is becoming more and more interested in it! Walking through the hall, I heard the sound of "fluttering" and "fluttering". I took a closer look, and it turned out that the kitten was dancing on tiptoe on the top of the fur ball. Looking at its intoxicated appearance and rhythmic movements, I couldn't help laughing, as if I were dancing a standard "waltz".

My observation composition is 400 words12 Thursday, July 26th.

This summer, it rained a lot and the air was very humid. You will find many snails in vegetable fields, beside lawns and on wet walls. I also caught some and put them in my pet jar. It's lovely to watch the little snail crawling around in the pet pot with its heavy shell on its back.

Friday, July 27th is fine.

This is my second day of raising snails.

Early in the morning, I picked up the pet cans to see how they were doing, but they were still struggling to find an exit. I think it would be better to feed them some food. Grandpa said that snails like to eat tender leaves and drink dew on them. I found food for these snails and put them in. I stared at snails, wondering where their mouths were and how they ate.

The snail stretched out its tentacles carefully, as if to spy on the situation ahead. It climbed up the leaves slowly. I didn't see its mouth clearly, but where it climbed, it left a small round hole. What a magical little snail!

Saturday, July 28th is fine.

A new day has begun. The little snail can't seem to accept this new home. They crawled in the pet jar day and night. They must be looking for an exit. Snails crawl slowly, but they will succeed one day.

I was moved by the persistent spirit of snails and thought, let them come out, but I can't bear to part with them. Finally, I opened the door of the pet jar. I believe that with this spirit, the little snail will definitely go further.

My observation composition is 400 words, 13, and waves of incense pass by me. Follow the aroma to the balcony and open the drying net. Ah! A lot of cute little sweet potatoes. One by one, bask in the sun online!

Most of them are oval. I took a piece and tasted it. It tastes sweet. I asked my mother, "How is this delicious dried sweet potato made?" Mother said, "Let's do it together." So we started the first step: washing sweet potatoes. There is a lot of mud on the outside of sweet potato, which is rough to touch by hand. Then I rubbed it hard with my hands to wash the mud off it. At this time, the color of sweet potato faded. Now you can put it in the pot and cook it. This is the second step. Next is the third step of drying sweet potatoes. I took out the freshly cooked sweet potato with gloves on. How soft! If you rub it by hand, there will be a hole. Be careful at this time, or you will burn your hands. You'd better ask your parents for help. Then, I put the sweet potato in their clothes-drying the net. After a long time, the sweet potato became hard, and my mother said, "This is easier to cut. Be careful when cutting. Be sure to cut it very thin. This is great, delicious. " Mother sliced the sweet potatoes one by one and laid them flat on the drying net. A day later, the sweet potato suddenly lost weight and felt a little hard. It tastes sweet and delicious.

Now, my sweet potato has become a real dried sweet potato.

My observation composition is 400 words 14. I have a good friend named xx. I didn't like xx the last time. Xx is brought by my grandmother, and my parents work in other places, so my clothes and pants are rustic and my hair is messy. I always avoid her when I walk, but from a small thing, I understand that she is so kind and lovely.

One morning, my mother woke up from a dream. I opened the curtain and saw, wow! Why are there dark clouds in the west and sunshine in the east? I dressed quickly and looked at my watch. It is almost seven o'clock. I quickly picked up my schoolbag, ran into the restaurant, took a piece of bread and ran out. Mother shouted at the back: "Take an umbrella"! As I ran, I replied, "No need." After school, I heard the sound of rushing. It turned out to be raining. I thought: I wish I had listened to what my mother said this morning. I have to go home in the rain. I just walked out of school. Suddenly, xx stopped me. She seemed to read my mind and said to me, "Take my umbrella and go home. Your home is a little far away, and my home is nearby. " Then he turned and left. At this moment, my throat seems to be blocked by a stone. I just feel tears coming down. I took the umbrella head and left without looking back. The next day, xx didn't come to class. It turned out that she got sick in the rain yesterday. I think xx is so kind. From then on, xx and I became good friends.

From this little incident, I learned that you can't judge a book by its cover. It depends on whether her heart is beautiful.

My observation composition 400 words 15 Today is a gloomy day. I came to the garden early to observe plants and animals.

In the garden, we can see many ants crawling around together. People are very scared when they see it. Do you know why ants move? Let me tell you something!

Because before it rains, ants can predict in advance that they will move food from low places to high places in order not to let the rain wash away their homes.

Look, they are moving food, with bread crumbs, bugs and flying wings. There is a dark ant here, which seems to be exploring the road, followed by an ant with a small body like a grain of rice.

There are ants running around in a hurry. I picked up one and put it in my palm. There is a sharp mouth in front of the head, slender feet, and they grow on the small face of the body.

The ant's body is divided into three parts. The first part is its head, it has black eyes; The second section is the waist, which is the thinnest part of the ant body; The third section is the tail, which is as round as the head and about the same size.

Ants are like a figure of eight as a whole, and ants are smaller than mung beans. I put it back after observing it, for fear of crushing it. Although they are very young, we are hardworking, united and brave. We should learn from them, be hardworking, united and brave.