How can I tell a sparrow chick from an adult male?

The corners of the beak of the sparrow chick are tender yellow, and the black feathers around the eyes and beak of the male are thicker, and the earth-colored feathers on the top of the head turn red. Even then, the difference is not big and it is difficult to identify.

The surface of the neck of the female is milky or brownish-yellow, and some have a layer of dark wrinkles. The external surface of male chicks is pale red, and the edges of the Yi holes are reddish but not obvious. 2. Size:

It can be distinguished by the size of the bird, usually the female shellfish will be smaller, and the male shellfish will be relatively large. 3. Tail length: The user observes the length of the bird's tail, the longer tail is male, and the shorter tail is female.

Extended information: Precautions for raising birds: 1. Raising birds needs to pay attention to the species of birds, generally speaking, birds in the south do not have seasonal characteristics, while birds in the north have such characteristics, so they should be raised according to the characteristics of different birds, so that healthy birds can be raised.

2. The weather in the north has a large temperature difference when the seasons change.

Ask the parrot how to tell the difference between male and female.

3. The most accurate way for budgies to distinguish male and female is to look at the wax film color of the nose, and the wax film color of male and female tiger skin is different for different sexes and ages. Additional Information: Budgies are native to Australia and are mostly wild and tend to move in groups.

They feed mainly on plant seeds, and when they are raised, the keeper also needs to prepare suitable and healthy food according to the eating habits of the budgie for feeding. In China, budgies are one of the most popular pet birds, and they are also wild species of national second-class protected animals.

Male and female birds are generally distinguished by their feathers, with males with beautiful feathers and females on the contrary. Some are distinguished by the large crown and the small one. There are also those who discern by discernment. It is the male {male} who distinguishes the loud sound that sounds good, and the female {female} who does not.

Male birds are generally larger and more colorful than females. This is how male and female birds are judged.

From the outside, the male bird has a beautiful coat color, a relatively large head, a back of the head, and a wide beak, and vice versa.

The two eyebrow lines extend all the way to the back of the head, and the eyebrows are thick, and they are connected at the back of the head to become a male bird. This is one of the main signs to distinguish between male and female.

First, look at the head. The female bird has a small head, no back of the head, and is narrow near the beak. The male is a male with a large head and a back of the head and a wide beak.

Second, look at the eyes. The eyes are large, the eyes are on the top of the mouth, and the eyes are closer to the corners of the mouth are male birds. The eyes are small and blank, the eyes and the mouth are in a straight line, and the eyes are far from the corners of the mouth is the female bird.

3. Look at the eyebrows. The eyebrows are white, wide and long, or narrow and long, but the eyebrows are clear and beautiful, the two eyebrow lines extend all the way to the back of the head, the eyebrows are thick, and they are connected at the back of the head as a male bird. This is one of the main signs to distinguish between male and female.

The eyebrows are thick and short, the eyebrow color is not distinct, and some of the eyebrows are interrupted in the middle, and the female is not connected at the back of the head.

Fourth, look at the legs. The male bird has stout and long legs. The males hatched on the grassy flats, some of which have red legs, are more beautiful.

There is a saying: "The eyebrows of the thrush, the legs of the lark." This means that the eyebrows and legs are one of the main signs to distinguish between male and female thrushes and larks.

The female bird with thin and short legs that is not stout is the bird. When looking at the legs, pay attention to observe whether the claws, feet, and legs are broken or injured, and whether the feet are inwards or toes.

1. Different body shapes:

1. The female sparrow is thinner.

2. The little sparrows are a little fat.

Second, the color of the feathers is different.

1. The plumage of female sparrows is darker.

2. The feathers of small sparrows are lighter in color.

Third, the mouth is different.

1. The female sparrow is dark brown and hard.

2. The little sparrow's beak is slightly yellow.

Extended Information: Sparrows are small birds of similar size and color. The body is generally brown with black spots, so it is commonly known as a sparrow. The main feather 9, the outer feather is at the base of the feather and the proximal end of the feather, the shape is slightly enlarged, arranged with each other, slightly into two transverse spots, especially visible in flight.

The snout is short, thick and strong, conical in shape with a slightly curved crown. When you close your mouth, there is no space between your upper and lower mouths. Males and females tend to have differences in color in their plumage. Male pure liver brown from forehead to nape of neck; upper body sandy tan with black stripes;

There are two distinct light white stripes on the wings; blackening of the jaw and throat; Females are males, but lighter or darker in color, with black forehead tips and cheek feathers and yellow beak bases.

1. Observe your eyes.

When you can't distinguish between male and female sparrows, you can observe their eyes, usually the eyes are large and focused, the eyes are on the top of the mouth, the eyes are closer to the corners of the mouth is the male, and the eyes are small and daze, the eyes and the mouth are in a straight line, and the eyes are farther away from the corners of the mouth is the female.

2. Observe the eyebrows.

Male and female can be distinguished by observing the characteristics of the sparrow's eyebrows, if the eyebrows are white, wide and long, or the eyebrows are narrow, but the eyebrows are clear and beautiful, the two eyebrow lines extend to the back of the head, the eyebrows are thick, and the male bird is connected at the back of the head.

3. Observe the wings.

When distinguishing between male and female sparrows, if there are 6-12 white feathers in the flight feathers of each wing, and the flight feathers are white and shiny, it is a male bird, and conversely, if there are less than 6 white feathers in the flight feathers of each wing, and the female bird has a dull feeling.

4. Observe the coat color.

The male and female of the sparrow can be distinguished by the color of the feathers, generally the male sparrow's cheeks and roar are pale blue-gray, and the hair color of the mouth to the root of the roar can be seen faintly black, while the female sparrow's cheeks and the hair color of the roar are light yellowish-brown.

Discharge cooling is another type of convection cooling. Unlike regenerative cooling, the coolant used for exhaust cooling absorbs heat to the thrust chamber and is discharged out of the combustion chamber instead of entering the combustion chamber to participate in combustion. Direct drain coolant reduces the thrust chamber specific impulse, so the coolant flow for drain cooling needs to be minimized while only using drain cooling at the outlet section of the nozzle that is relatively less heated.

There is also radiative cooling, in which the heat flow is transferred from the combustion products to the thrust chamber, and then the heat is radiated by the thrust chamber wall to the surrounding space. Radiative cooling is characterized by simplicity and small structural mass. It is mainly used in the extension section of large nozzles and the thrust chamber of small thrust engines using high-temperature resistant materials.

When cooling in the thrust chamber of the tissue, a relatively low temperature liquid or gas protective layer is established on the surface of the thrust chamber wall to reduce the heat flow to the thrust chamber wall, reduce the wall temperature, and achieve cooling. Internal cooling is mainly divided into three methods: internal cooling (shield cooling), membrane cooling and diaphoretic cooling of head tissues. After the internal cooling measures are adopted in the thrust chamber, the mixing ratio near the wall of the combustion chamber is different from the optimal mixing ratio in the central area (in most cases, the near-wall layer rich in fuel is used) due to the need to reduce the temperature of the protective layer, resulting in the uneven distribution of the mixing ratio along the cross-section of the combustion chamber, so that the combustion efficiency is reduced to a certain extent.

Membrane cooling is similar to shield cooling in that it cools the thrust chamber wall by establishing a uniform and stable coolant film or air film protective layer near the inner wall surface, except that the coolant used to establish the protective layer is not injected by the injector, but is supplied through a special cooling belt. The cooling band is generally arranged in a cross-section of the combustion chamber or the convergence section of the nozzle. There can be several cooling bands along the length of the combustion chamber.

In order to improve the stability of the membrane, the coolant often flows through the gaps or small holes in the cooling belts, and when sweating is used, the thrust chamber wall or part of the inner wall is made of porous material with a pore diameter of tens of microns. Porous materials are usually sintered with metal powders or pressed with metal mesh. In this case, the number of pores per unit area is increased by making the micropores in the material as evenly distributed as possible.

The liquid coolant penetrates into the inner wall, creating a protective film that reduces the density of the heat transferred to the wall. When the flow rate of liquid coolant used for sweat cooling is above a certain threshold, a liquid film is formed near the wall of the thrust chamber. When the coolant flow rate is below the critical flow, the inner wall temperature will be higher than the coolant boiling point at the current pressure, and some or all of the coolant will evaporate, forming an air film.

In addition to the above thermal protection, there are other thermal protection methods such as: ablation cooling, thermal insulation cooling, hot melt cooling and composite protection of chamber walls. 3. Thermal protection scheme of high enthalpy gas generator Based on the above methods and the actual situation, the thermal protection method of high enthalpy gas generator is obtained.

The combustion chamber of a high-enthalpy gas generator differs from that of a liquid rocket engine, eliminating the front thrust chamber part, making its structure simpler and more effective. Then, the thermal protection involved is the thermal protection part of the combustion chamber wall. As the fuel enters the combustion chamber, it quickly decomposes and releases large quantities.

First of all, look at the head, the female bird with a small head without the back of the head, and the male bird with a large head and the back of the head.

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Look at the eyes, the big eyes are the male birds, and the small eyes are the female birds.

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Looking at the eyebrows, the white and long eyebrows are male birds.

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It can also be distinguished from the legs of the sparrow, which is thicker than the legs of the female.

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Male sparrows, with long and thick beaks, are males, and females are the opposite.

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Looking at the feathers, each male sparrow has 6 to 12 white feathers on each wing, and the female sparrow generally has less than 6.

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This can be distinguished from the body type, because the female is small, and the male is relatively large. So this distinction is to know the male and female sparrows.