The structure of a bird s eyes and why a bird s eyes grow on the sides of the head

The general structure of birds' eyes is similar to that of other vertebrates, but they are larger, less spherical, and barely immobile in place of non-rotating eyes as they navigate the field of view by relying on their long, curved necks. The light-sensitive retina is refined with rod cells (dim light vision) and visual dimension (chromic vision). The birds of the cone are dominant during the day, and the bird stem cells are abundant at night.

The unique feature of the bird's eye is the conjunctiva with abundant blood vessels, which attaches to the retina of the myopic nerve and abruptly into the vitreous fluid. The retina is vascular, and relies on the conjunctiva for oxygen and nutrients.

The position of the bird's eye is on the head, which is related to its habits. Herbivorous birds must avoid predation and have their eyes on the sides, allowing them to have a large view of the world; Predatory birds such as hawks and owls have eyes ahead. The central fossa is the sharpest part of the retina (predators and others) and is located in a deep fossa that enables close and accurate adjustment of the focal length.

In addition, many birds have two acute central fossa in the retina – the one for the sharp monocular view and the latter for the binocular view. Probably able to use both front and back eyes**. The crow points upwards and can also look at the viewer with both eyes in a frozen posture.

An eagle has 8 times the sharpness of vision and can see a crouching rabbit clearly, and an owl has 10 times the eyesight of a human in low light. Birds are good at sensitizing color, especially at the end of the red spectrum.

Most birds have eyes on the sides of their heads, and when they spot something, they tend to turn their necks so that one of their eyes is facing the object being looked at. As you said, the bird is in"Peep"You, I don't know if you've noticed, it's bending its neck and looking at you sideways.

When birds are not looking at something, that is, usually, their brains can process all the scenes from both sides at the same time, and once they find something noteworthy, they will tilt their heads and use one of their eyes to look at it.

Scientific studies have shown that if you are facing a bird, it will not be able to spot you. If you can get close to you silently, you can catch the bird facing you alive.

As for the large movement of the eyes of birds, in fact, the range of their eyes is very small, and it is impossible for them to roll their eyes like humans. It's just that when they blink, there's a layer of white inside the eyelids"Inner eyelids"The direction of movement of the inner eyelid is usually 90 degrees from the direction of movement of the outer eyelid, and when the bird blinks, the outer eyelid does not move, but the inner eyelid blinks, so it gives people the illusion that its eyes have white eyeballs flashing and flashing.

If you pay attention, you will notice that the outer eyelids of birds are only used for napping and sleeping, and they do not blink with them.

Birds' eyes grow on the sides of their heads, how do they look forward?

The bird's eyes are long on both sides, and the vision can be rotated 180 degrees, and it can see two different perspectives, which is much larger than the human eye. This is determined by the bird's eye structure. Bird's eye structure is a tiny cavity structure in carbonate rocks, and the shape of the cavity resembles a bird's eye, hence the name.

A sedimentary structure formed by the filling of globlite, calcite, or gypsum cements in argillaceous, microcrystalline or chondrite sedimentary rocks in groups or individually, generally a few millimeters in size, and roughly parallel bird's eye pores. That's why some people call it a sieve, pane, or grid-like structure.

That is to have a wider field of view so that prey or predators can be spotted in time.

Summary. Hello dear, the eye is the head of the bird, the area between the side of the eye and the beak of the bird. From the first volume of "Birds of China" The concentrating system of the bird's eye is very special, and some birds can look in two directions at the same time.

The cone cells in many birds' eyes contain a color oil that can absorb blue light, which can be like a color filter for an ultraviolet camera, which can remove the fog on the **, so that the bird's long-distance physical vision is greatly enhanced. Hope mine can help you, oh dear<>

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Hello dear, the eye is the head of the bird, the area between the eye side and the beak. From the first volume of "Birds of China" The bird's eye concentrating system Xunji is very special, and some birds can look in two directions at the same time. The cone cells in many birds' eyes contain a color oil that can absorb blue light, which can be like a color filter for an ultraviolet camera, which can remove the fog on the **, so that the bird's long-distance physical vision is greatly enhanced.

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The muscular tissue in the bird's eye has a dual adjustment function, so the bird's eye can change from a farsighted "telescope" to a myopic "microscope" in an instant, which is exactly what is necessary for the bird to orient, find food, and avoid enemies in flight. For example, an eagle can clearly see a mouse on the ground when flying at high altitude, and when it dives down at high speed in a matter of seconds, it can accurately grasp it, all thanks to a pair of magical eyes.

Birds have the ability to distinguish colors, such as peacocks, which attract each other with their feathers.

With the exception of some birds that are accustomed to nightlife, such as owls, which cannot recognize colors because there are no cone cells in the retina, many birds have a sense of color. Crows fly at high altitudes and need to find a place to land, and the color will help them judge the distance and shape, so they can catch the insects flying in the air and land lightly on the branches. The birds' ability to discriminate colors is also beneficial in their search for mates.

Think about it, male birds often use bright feathers to attract the opposite sex, if they can't feel the color, then what is the charm of male birds?

It's not the same. Their eyes have a unique anatomy. Owls can see blue, eagles have two visions, and migratory birds are said to see the Earth's magnetic field.

Birds are colorblind, they can't tell the difference between colors!

They all look to the sky with white eyes, full of stubbornness and stubbornness. With its peculiar image and concise shape, the image in the painting is prominent, the theme is bright, and even the eyes of birds and fish are painted as "white eyes to people", so as to trap the ants to express their arrogant and cynical character, thus creating an unprecedented flower and bird shape. The characteristics of pen and ink are good at laissez-faire, vigorous and round, clear and elegant, whether large or small, there is a simple and hearty and bright and healthy wind god.

The structure of the chapter is unconventional, and it seeks completeness in the incomplete. Zhu Qi's paintings had a great influence on later generations.

There are more than 9,000 species of birds in the world, and the main characteristics of birds are: the body surface is covered with feathers, the forelimbs become wings, and they have the ability to fly quickly; There are air sacs in the body; High and constant body temperature The body structure and physiological characteristics of the Danshi Mausoleum of birds are adapted to its flight life

So the answer is: 9000; The nucleus is like the body surface is covered with feathers, the forelimbs become wings, it has the ability to fly quickly, there are air sacs in the body, and the body temperature is high and constant; Flying for life

There are so many kinds of birds, and there are quite a few that we know well, but there is one bird that is known as the world's oldest "mother" -- a 66-year-old wild bird mother, and do you know what kind of bird it is?

In birds, the pupil light reflex is sensitive and sluggish.

What is the reason.