The structure of animal eyes, what are the characteristics of the eyes of various animals

What kind of animal? Insects and mammals are not the same.

Snailseyes on its antennae. The snail has two pairs of antennae and eyes at the tip of its larger pair of antennae.

SquidThere is a pair of well-developed eyes on both sides of the head, the structure of which is relatively complex, the outermost transparent cornea, without holes; the middle layer is the sclera, the peripupil is iridescence, connected to the sclera, and behind the pupil are crystals and agile muscles; The inner layer is the retina, which is mainly composed of rod-shaped bodies, and the outer layer is retinal cells. The structure of the eye resembles that of a vertebrate, but is formed by ectodermal invagination.

MonkeysCharacteristics of the eye: posterior orbital protrusion, which develops to form a bony eye ring, or is completely closed to form an eye socket.

OwlsThe eyes are located directly in front of the face, which gives them excellent depth perception during hunting, especially in dimly lit environments. Interestingly, the big eyes are fixed in the owl's eye sockets and cannot be rotated at all, so the owl has to keep turning its head.

GoldfishThere is a protective film on the outside of the eyes, and goldfish cannot blink.

FliesThe eyes are compound eyes and are made up of about 4,000 small eyes.

1. Cat's eyes.

Cats are a very common animal, I believe that many people have this kind of pet at home, very docile and cute, but have you ever carefully observed the cat's eyes? Even the eyes of cats are very different from those of us humans, cats belong to the typical nocturnal predators, with vertical small shaped pupils.

2. Squid's eyes.

Squid is also a very common sea creature, and everyone should be familiar with squid, and even many people have eaten this sea creature, and the taste can be said to be very good.

But the eyes of the squid can be said to be the most evolved in the animal kingdom, which means that their eyes can even be comparable to our humans, but their pupils are very different from human eyes, and if you look closely, you will find that their pupils show a W shape.

3. Chameleon's eyes.

A very special animal in nature, mainly because chameleons can produce different colors according to the changes in the surrounding environment, so that they can camouflage themselves well, and at the same time, they also bring great convenience to their own food.

4. The eyes of an owl.

Owls can't move their eyeballs like we humans, so they can only look at objects in different directions by turning their heads.

5. The eyes of a large crocodile.

The eyes of large crocodiles are uniquely positioned to remain above the surface of the water when their entire head is submerged, where they are used to search for prey.

6. Butterfly's eyes.

Butterflies see ultraviolet rays that are invisible to the human eye, guiding them to flowers that have delicious nectar.

In fact, there is no exact and complete classification of the eye in nature. Some of the eye classifications include camera eyes, compound eyes, mirror eyes, nesting eyes, and so on. The human eye is a typical camera-type eye that uses a single lens (eyeball) to focus the image onto the light-sensitive retina.

Some of the other camera-type eyes in nature can be camouflaged, but our eyes cannot. Camera-eyed animals adjust their lenses in different ways to see objects at different distances. While scientists have long known the function of each part of the camera-type eye, there is still a long way to go to create a fully functional artificial eye.

Scientists are making inroads into another type of eye found in nature——— compound eyes. There are compound eyes in insects and arthropods. The compound eye is made up of many individual lenses.

The single unit of imaging is called the "small eye". Dragonflies, for example, have a single compound eye with 10,000 lenses. Some compound eyes can process images at the same time, with each lens transmitting its own signal to the brain of an insect or arthropod.

This allows them to quickly spot targets and identify images, which is why flies are so difficult to hit.

Here's a brief look at a few special types of eyes

UV signposts for bees: Bees and butterflies can see ultraviolet rays that are invisible to the human eye. Over a long period of natural evolution, flowers that rely on bees and butterflies for pollination emit a special ultraviolet light that directs bees to collect honey.

Eyes on tentacles: The soft sponge appears to have no eyes, but its photoreceptors are actually located at the tip of each tentacle.

Scallop eye: There is a kind of shell called scallop in the ocean, which has 50-100 mirror eyes, each of which can reflect light to the silver fiber front light sensory in the middle of the mirror eye.

Red-eyed Tree Frog: The Costa Rican red-eyed tree frog has limited vision, and both its neurobehavioral and jumping reflexes suggest that it can only see moving prey.

There are many kinds of animals, and the anatomy of the eyes is also diverse. The green eye insect in the protozoa, its eye is a red eyespot and can only feel the intensity of light, which is the most primitive eye. The snail's eyes grow at the tip of a pair of antennae above the head, which are as small as pinholes, and the structure is very simple, called "pinhole eyes", which can only vaguely identify directions, so snails can only crawl slowly.

Compound eyes are eyes specific to arthropods (e.g., centipedes, spiders). It is composed of a large number of small eyes, each small eye can only feel a small part of the image, and many hexagonal small eyes are connected together to form a compound eye, which can bring together all the images seen by the small eyes to form a complete picture, can observe distant objects and distinguish the direction, the more small eyes, the stronger the vision. However, the ability of insect eyes to perceive color is very poor, and the colorful nature is a monotonous world in their eyes.

The eyes of insects such as dragonflies and flies are compound eyes, which are made up of thousands of small eyes.

The eyes of fish are varied, such as the two eyes of a flounder are on the same side, and the eyes of goldfish have various shapes. But all fish don't have real eyelids and don't have tear ducts, so you'll find that fish always have their eyes open, don't close their eyes, and don't shed tears.

Birds have the best eyesight. When the eagle soars at an altitude of more than 1,000 meters, it can clearly see the activities of small animals on the ground. Owls can also see voles moving around the fields on moonlit nights.

The snail's eyes protrude forward and can be contracted. The squid has proportionally the largest eyes (it seems to be oh), the monkey's eyes are similar to those of people, owls can open one eye and close one eye and take turns resting, goldfish have a protective film on the outside of their eyes and cannot blink, flies are compound eyes, which are composed of hundreds or thousands of small eyes, which can form a number of images and transmit them to the brain, so that in its eyes, all things that move will slow down The largest eye is the king squid, which lives in the deep waters of the Pacific Ocean and the Atlantic Ocean The most beautiful eyes are cats, and there is also a gemstone called opal The smallest eyes are rats Banga tarsiers have bigger eyes than brains, and the most peculiar eyes If you talk about the proportion of eyes to the head, the biggest eyes are tarsiers. Tarsiers have big eyes.

In fact, each of its eyes weighs 3 grams, which is heavier than its brain. They are very sensitive to danger and even have one eye open when they are resting. Tarsiers have large eyes, which are ideal for nocturnal predation.

They eat insects, frogs, lizards and birds. One species of tarsier is also capable of preying on birds and poisonous snakes larger than themselves. The tarsier is the size of a large mouse, and its whole body is yellowish-brown, which at first glance looks like a brown house mouse.

If calculated according to the proportions of the body, the tarsier can be the champion of the primates: the largest eyes, the largest ears, and the longest phalanges. In terms of absolute size, the eye diameter of the king squid can reach 41 centimeters long.

The fly's eye is a kind of "compound eye", which is composed of more than 30o0 small eyes, and people imitate it to make a "fly's eye lens". The "fly's eye lens" is made of hundreds or thousands of small lenses neatly arranged and combined, and it can be used as a lens to make a "fly's eye camera", which can take thousands of identical photos at a time.

The king squid with the largest eyes, the cat with the most beautiful eyes living in the deep waters of the Pacific Ocean and the Atlantic Ocean, and there is also a gemstone called opal.

The smallest eyes are rats.

The eyes of the Banga tarsier are larger than the brain and the eyes are the most peculiar.

The fly's eye is a kind of "compound eye", which is composed of more than 30o0 small eyes, and people imitate it to make a "fly's eye lens". The "fly's eye lens" is made of hundreds or thousands of small lenses neatly arranged and combined, and it can be used as a lens to make a "fly's eye camera", which can take thousands of identical photos at a time.