Write a composition according to the characteristics of birds.

1. The characteristics of birds, high bone healing in the composition: birds have high bone healing. For example, their spines heal into several combined vertebrae, unlike mammals, which can move freely within a certain limit.

The high healing of bones is conducive to improving the strength of birds' bones and reducing their own weight, which is a feature of adapting to flying life. Feathers on the body surface: Feathers are genetically the same as scales of reptiles. Feathers are necessary for birds to fly and can be replaced by molting.

Birds' feathers are divided into normal feathers, secondary feathers and down feathers. See feathering and molting for details.

Respiratory system: Birds have different respiratory systems. Its basic unit of gas exchange is not alveoli, but microtubules, which have air sacs distributed in the bones of the whole body. When inhaling, air enters the airbag from outside the body for the first gas exchange, and when exhaling, gas is discharged from the airbag for the second gas exchange. Therefore, birds have to exchange gas twice every breath, and the gas exchange efficiency is obviously higher than that of mammals. In addition, the existence of airbags further reduces the weight of birds.

Reproductive and excretory system: Whether the reproductive system of male and female birds expands and functions only in the breeding season, its reproductive system will shrink in the non-breeding season, and it is difficult to find even if it is dissected. Birds have only one kidney, and the other kidney naturally atrophies; The main metabolite of birds is water-insoluble uric acid, which can effectively reduce the weight of birds.

Digestive system: the digestive system of birds is obviously shorter than that of mammals, which is also a reason for frequent excretion of birds, but a shorter digestive system helps to reduce the weight of birds.

2. The characteristics of birds are lovely birds.

There is a lovely bird in the yard, singing happily. Very interesting! How cute!

This kind of bird has a small body, with dark gray feathers, a round head, a sharp mouth under a pair of bright and flexible eyes, and a pair of pale yellow claws, which cling tightly to branches.

Birds sing clearly and always like to give people a euphemistic voice. It's my good friend. Every morning, it will fly to my window and chirp nonstop, as if to say, "Good friend, good friend, get up, get up, go to school!" " "I got up at once, and it flapped its wings and flew to me. I quickly smiled and said, good friend! " Once, when I was doing my homework, I met a difficult problem. I can't think of it after thinking about it. Just as I was about to give up, the bird flew over, landed at the window and kept calling, as if to say, "My good friend, don't give up, use your head and find a way." I believe you can do it! " Suddenly, I regained my confidence, kept thinking and doing, and finally figured it out, oh! I really want to thank my good friend-Bird. Whenever I encounter difficulties, Bird always comes to encourage me and "recharge" me. Whenever I make progress, birds always surround me to congratulate me and encourage me not to be proud and study hard … What a sensible bird!

Bird, bird, bird, I love you.

3. Composition describing the characteristics of birds 150 word lark: commonly known as lark or sand lark, also known as Mongolian pipit. Zhangjiakou people are also called "larks"

Origin of lark: it is distributed in the vast area of Bashang, Inner Mongolia, Zhangjiakou, Hebei Province, in the east of Qinghai Province. Most of them live or breed all the year round.

Lark's body shape: Lark is smaller in adult, with a body length of 190mm and a weight of about 30g. Chestnut-red forehead is the characteristic of male lark. Its head and back neck are the same color as the forehead, and the white and brown coat around eyebrows and eyes is more beautiful. Its eyebrows are the most distinctive, and the eyebrow line has grown to the pillow. Lark's back and waist are mainly chestnut brown, the feathers on the outside of its wings are dark brown, and the tail edge, which is mainly chestnut brown, is slightly white. There are two symmetrical black stripes on the chest, which are just connected with the upper part of the chest. There are white feathers on the forehead and throat, which just set off the brown and white fur color under the body.

The difference between male and female larks: The body color of the female lark is almost the same as that of the male lark, but the chestnut red hair on the forehead and neck of the female lark is less than that of the male lark, and her feathers are closer to light brown, and the two black spots and stripes on her chest are not as obvious as those of the male lark. The color of the mouth is khaki and the toes are pink. Its claws are different from those of ordinary birds, especially its hind claws, which are larger than those of ordinary birds and extend straight to the rear. The color of claws is brown.

Larks' habits: Even though they still like to live on the desolate prairie, they shuttle between the sand and the grass forest. In order to keep their body temperature, they rub on the beach, which can not only prevent heatstroke and cool down, but also comb their hair to ensure the cleanliness of their body surface.

Miscellaneous eating habits, such as grass buds, weeds and weed seeds in spring; Insects are the staple food in summer and autumn; In winter, herbivores and various cereals also feed on insects and eggs. Larks will never destroy crops. In summer, when they are still raising young birds, larks will catch a lot of bugs to feed sheep larks, which has made great contributions to farmers' land and is an indispensable beneficial bird in the production area.

Breeding of lark: it can breed from May to July every year, and can breed 1~3 nests.

Lark breeding: Ornamental larks are kept in unique bamboo lark cages or displayed in larger cages. The cage is covered with fine sand, and there is no habitat in the cage. Adequate drinking water and bath water should be supplied.

Domesticated larks, it is best to start with chicks. When they grow up, they are easy to sing and dance, and their appreciation value is much higher than that of individuals who catch their own birds. It is generally believed that chicks born at 1 week have the best artificial feeding effect.

The 7-year-old lark can't feed and needs artificial feeding, 1 time 1.5~2 hours, 4~6 times a day; Fill two or three mouthfuls at a time. The specific methods are as follows: feed preparation: pea powder 500g (steamed), mung bean powder 100g (steamed), cooked eggs 5 5- 10/0g, cricket, grasshopper and other insect powder 100g, etc. Mix well and dry for later use.

The daily feed for adult larks can be mixed powder of larks, eggs and millet, and a small amount of insects. Experienced breeders often feed larks with insects in cages and train larks to eat insects or other feed from their hands, so as to achieve better domestication effect.

To write a composition about birds, you must adopt a small red and green cage in front of the old lady's house, where a lively parrot lives.

This parrot is very beautiful. It has a coat like a rainbow. The mouth is red and the streamline bends down like a small hook. Open your mouth, and you will see its lovely, small, pink and round small tongue dancing "Ballet" in the "Mouth Theater". The little head is orange, move over there! Move it. How clever! Looking slowly from its head to its body, it naturally changes from orange to golden yellow and from golden yellow to green. Feathers are smooth, shining in the sun, so beautiful! The feathers on its tail are very long and purple. When walking, its little tail twists and turns, which is fun and funny! Looking at it, I like this parrot more and more. I took my mother's hand and came to the small cage. I stared at it, and it stared at me. "Mom, why didn't it bark?" I watched it for a long time, but I just didn't scream. "Wait a minute ..." "Ji Ji! Hey! " Before my mother finished, it screamed a few times and made me tremble. My mother laughed at me and said, "You are so timid, aren't you a bird?" Mom just said, "Gigi!" "ouch! Scared me to death! " A bird's cry also startled her. "You are not also very timid? Also say me! " I winked and said to my mother playfully. I asked my mother again, "Where did you say this parrot came from?" "How should I know? You have to ask grandma's wow! " Grandma told me that this parrot flew to my uncle's feet and caught it, bought a cage and put it in it! I see. Where did it come from? Ha ha! Nobody knows!

Parrot, you are so lively; So cute; Too smart ... let people keep your smart figure in their hearts forever!

5. A bird's composition, describing the bird's appearance characteristics, bird's living habits and bird's growth process. [Sparrow Composition] When I was playing happily in the Woods, I suddenly saw a little sparrow, and its wing was hurt. I caught it gently, held it in my arms and took out a small cage from the utility room. Sparrow composition

I gently put the sparrow in, and then put the small cup for feeding the bird in the middle of the cage; Grandpa put the millet to feed the birds in one cup, and the other cup was filled with water. When everything is ready, we send them to the birdcage.

When the sparrow saw the yellow millet, it buried itself in eating. Grandpa and I watched happily.

Look at it, it's beautiful: small yellow beak, bright black eyes and beautiful feathers, like wearing a flowered skirt. Sparrows have been chirping and jumping around in cages, as if calling their parents, mothers and companions. Sure enough, it didn't take long for the sparrow's companion to fly to my balcony and flowers, and chirp with it.

After a while, an adult old sparrow flew over and flew to the birdcage. The little sparrow fluttered its wings with joy and cried happily. I think this sparrow may be the mother of the little sparrow! It kept combing the sparrow's feathers, and the sparrow slowly calmed down and stopped barking. Later, more and more sparrows gathered and danced around my balcony. After eating, the little sparrow combed its feathers leisurely and then dozed off at the old sparrow.

The scene is very touching. It will be fine the next day. The old sparrow has never left my balcony. I saw the little sparrow flapping its wings in the cage, as if to say that I can fly. If I open the cage, it will fly out at once, flying around my balcony under the guidance of the old sparrow, barking and refusing to leave, as if to say, "thank you!" Thank you! " I really want to keep him, but I think he will be happier with his mother and his companions.

Little sparrow, I can't bear to part with you.

6. A 600-word composition about birds requires grasping the characteristics, appearance and calls. If I hadn't written a composition about birds and asked me to observe them, I hadn't noticed that our neighbors had fed so many birds in our garden! These birds are all kept in cages. Budgerigar with tiger pattern; White-tailed bird with white feathers; Red-billed jade with a red and pointed mouth; There is a thrush with long white eyebrows ... In another cage, there is a bird much smaller than other birds. I look familiar-its color is bright, its feathers are green and bright, its head is olive, its abdomen is auburn, and its mouth is long and sharp. I asked my grandfather who keeps birds, and he told me that this kind of bird is called kingfisher.

I was pleasantly surprised to hear that. Didn't we just learn the lesson of "kingfisher"? I came to observe the bird again with a special feeling-it was restless, always flying up and down in the cage, jumping around, as if to break the cage and fly out. I suddenly feel sorry for the text I just learned. I think it may be eager to return to its cave on the steep rock wall; Maybe it is trying to fly against the current; Maybe it wants to stop on the reed pole and wait for the small fish to swim to the surface ... Looking at the kingfisher scurrying around in the cage and other birds in the cage, I suddenly have a resentment-why do people lock them up? They belong to nature and should not be imprisoned in this cage! Dude, you should let this bird go!