Why do different animals have different pupil shapes?

Why the shape of the pupils of animals is different is explained as follows:

The shape of the pupils of different animals.

Scientists have made some points about the function of the long pupil in the past. It is believed that due to the dilation of the long strip pupil.

The area of light transmission varies greatly from contraction, so this pupil allows diurnal animals to better adjust to light. In addition, the long strip of pupils increases the clear imaging distance of the transverse or longitudinal contours. It has also been speculated that in animals with multifocal eyes, the long pupils are better able to maintain image quality when contracted.

However, none of the above speculations can explain why some animals have horizontal pupils while others have vertical pupils.

To analyze the relationship between pupil shape and terrestrial animal habits, the researchers analysed 214 terrestrial animals from different families. They will be the ecological niche of these animals.

Predators were compared with eaters), the time of day (diurnal, nocturnal, diurnal), and pupil shape (circular, near-round, vertical, horizontal), and it was found that there was a clear relationship between pupil shape and their ecological niche. For example, herbivores (such as zebras) that are eaters.

Most have transverse pupils, while most diurnal active predators (e.g., cheetahs) have round pupils, while nocturnal and diurnal ambush predators (e.g., spotted cats) usually have vertical pupils.

The link between pupil shape and ecological niche is evolutionary and natural selection.

There are some exceptions, such as the herbivorous but vertically pupiled chinchilla (chinchilla), and the carnivorous fox with horizontal pupils. In addition, there are other types of pupils that still exist in nature, such as geckos.

When the pupil constricts, four small orifices are formed, squid.

's pupils are wavy when they constrict? The study of these different pupil shapes will be an interesting challenge.

Have you ever noticed that a cat's pupils are vertical when they constrict, while sheep's pupils are horizontal? A new study has found a significant correlation between the shape of the pupils of terrestrial animals and their ecological nichesAnimals with perpendicular pupils may be ambushed predators, and animals with transverse pupils may be prey. Different shapes of pupils give animals different visions and play an important role in the survival of animals

In the past, scientists have come up with some ideas about the function of the long pupil. It has been suggested that the pupil varies greatly in the translucent area as the pupil expands and shrinks, and as a result, the pupil allows diurnal animals to better adjust their light. In addition, the long pupil can increase the clear imaging distance of the transverse or longitudinal contour.

It has also been speculated that in animals with multifocal eyes, the long pupils are better able to maintain image quality when contracted. However, none of the above assumptions can explain why some animals have transverse pupils and others have longitudinal pupils.

To analyze the relationship between pupil shape and habits of terrestrial animals, the researchers analyzed 214 terrestrial animals of different families. They compared the ecological niche, the time of day (daytime, nighttime, daytime activity) and the shape of the pupil (circle, semicircle, vertical bar, horizontal bar) of these animals (predator and prey) and found that the pupil shape had a clear relationship with its ecological niche. For example, herbivores that are prey (e.g., zebras) mostly have transverse pupils, while the most active predators during the day (e.g., cheetahs) have circular pupils, while nocturnal and diurnal ambush predators (e.g., spotted cats) often have vertical pupils.

So what's so special about the different shapes of students? By analyzing the optical properties of vertical and horizontal pupils, the researchers found that, firstly, for vertical pupils, the object is in the vertical depth of field。Images in the depth-of-field range are sharper than images in the horizontal direction, and images before or after this range are blurrier - meaning that objects before and after focus can be seen more clearly in the vertical direction than in the horizontal direction.

Therefore, the vertical pupil can assist in the stereoscopic vision of the eye, which is convenient for animals to estimate the distance of objects in the longitudinal direction; At the same time, the animal can estimate the distance of an object from itself in the transverse direction by the defocus ambiguity. Vertical pupils are more common in ambushed predators. The shape of this pupil allows them to more accurately estimate the distance between the prey and themselves without disturbing the prey.

The transverse pupil is mainly found in prey. The eyes of these animals are long and large on either side of the head, and the very wide monocular field of view can help them minimize blind spots. Compared to vertical pupils, horizontal pupils increase the depth of field of an object in the horizontal direction, making it clearer before and after imaging on the ground.

For prey, the transverse pupils not only help them have a clear lateral panoramic view to detect predators from different directions, but also to see the ground ahead when their eyes are on the sides. When they are chased by their eaters, they can see the terrain and flee quickly.

Mainly because its living environment is different, so the shape is different.

Because different animals have different body structures, the shape of their pupils is also different.

Because different animals have different genetic and physical characteristics, including the pupils.

I think because of the different structures in their bodies, they naturally manifest themselves differently.

The shape of the pupils of different animals is different, the pupils of cats are vertical, the pupils of frogs are horizontal, and the color is also different, and the clarity of what you feel is also different.

Most of them have vertical pupils, such as cats and snakes. The pupil of the sheep is slit-shaped. This is also due to the habits of the animals.

The pupils of animals are varied, such as dogs, different types of shapes are not the same, most of the pupils of cats are strip-shaped, and the visual effect of different pupils to animals is also different.

The shape of the sheep's pupils is rectangular.

The rectangular pupils and the eyes of the sheep that are biased to the sides of the head have a common reason, which is due to evolution, as a ** food animal, it must always pay attention to the surrounding environment in order to escape in time.

The position of the ears gives it a wide field of vision, and the rectangular pupils further increase the probability of the sheep escaping, the rectangular pupils have a function similar to a wide-angle lens, and the sheep's field of view is between 320 and 340 degrees, that is, they can see everything around them even if they don't turn their heads. Move your head a little and you can see the whole environment around you at a glance.

The role of the pupil

Changes in pupil size are controlled by the muscles within the iris, and these muscles are all circular, with one layer of muscle contracting and another expanding.

In low-light conditions, more light is needed to see objects clearly, so the pupils become larger; In order to protect the eyes, the pupils of the Gao nationality jujube will shrink in strong light. The pupils of animals function the same as those of humans, both of which are designed to regulate the amount of light entering and to have the best vision in various environments.

The shape of the sheep's pupils is rectangular. 。Sheep eyes grow on both sides of the head, this is because sheep live in the open grassland, this kind of left and right, flat pupils help sheep have a super wide field of vision, long-distance panoramic observation of the surrounding situation, more conducive to the detection of danger.

The habits of sheepThe sheep have a strong social behavior, and it is easy to establish a group structure, mainly through sensory activities such as sight, hearing, smell, touch, etc., to transmit and receive various information, in order to maintain and adjust the activities between the group members, and the head sheep and the winning sequence within the group help to maintain this structure. The face of the sheep is slender, the mouth is pointed, the lips are thin and the teeth are sharp, the upper lip has a longitudinal groove, the movement is flexible, and the lower jaw incisors have a certain inclination outward, which is very beneficial to the low grass, grass, flower buds and shrub branches and leaves on the feeding ground, and the chewing of grass seeds is also very sufficient, known as the scavenger.

The pupils of sheep are rectangular. 1. The pupils of sheep are rectangular.

2. The pupils of the dog Lu Jin are generally round. According to the different types, it is roughly divided into perfect round, almond-shaped socks, and oval.

3. The pupils of cats are almost vertical bars. If you dig a little deeper, you will find that in addition to the first two, the shape of animal pupils in nature is actually very strange.

For example, when the gecko's pupils contract, four small orifices are formed, and when the squid's pupils are contracted, they are wavy. There are also insects like dragonflies, butterflies, bees, etc., which have thousands of pupils.

The pupils of sheep are rectangular, because the eyes of sheep grow on both sides of the head, and live in the open grassland, this kind of left and right, flat eyes help sheep to observe the surrounding situation, increase the probability of finding danger, and then improve the survival rate, in addition to sheep is a mammalian ruminant, its breed is rich and diverse, and the body surface is densely pubescent.

The pupils of sheep are rectangular, because the eyes of sheep grow on both sides of the head and live in the open grassland, this kind of wide left and right, flat eyes help sheep to observe the surrounding situation, increase the probability of finding danger, and then improve the survival rate.

Sheep is a mammalian ruminant, the head generally has a slippery or horn, and the horns of the male sheep are spiral, while the female sheep has no horns or only small horns, in addition, the body of the sheep is plump, the body surface is densely pubescent, and the limbs are long and thin.

The belief and line breeds of sheep are rich and diverse, the more common ones are sheep, yellow sheep, lake goats, goats, rock sheep, etc., among which sheep are common breeding animals in our country, their temperament is docile and timid, easy to tame, and goats have a wide range of distribution, strong adaptability to the environment.

The pupils of sheep are rectangular. In the open grassland, the left and right width of the sheep's eyes, the upper and lower flat pupils can make the sheep's vision wider, and the sheep's pupils are conducive to observing the surrounding situation, avoiding danger, and increasing the probability of escape. Sheep is a general term for the sheep subfamily, mammals, artiodactyls, bovidae, sheep subfamily, and is one of the domestic animals of humans.

Hairy four-legged ruminants are the main ** of wool. The coat color is mainly white and land-hued. Goats and sheep are mainly raised in our country.

Sheep is a general term for the sheep subfamily, mammals, artiodactyls, bovidae, sheep subfamily, and is one of the domestic animals of humans. Hairy four-legged ruminants are the main ** of wool. The coat color is mainly white pants macro. Goats and sheep are mainly raised in our country.

Sheep are also known as sheep or white sheep. Hairy four-legged ruminants. It was originally a product of the mountains of the northern hemisphere and was related to goats; The difference is that the body is fatter, the body is plump, and the body hair is dense.

Short head. Males have large, spiral-shaped horns, while females have no horns or only tiny horns.

Sheep is one of the six animals, as early as the matrilineal clan commune period, the original inhabitants living in the grassland areas of northern China have begun to choose the abundant water and grass along the river and lake Hu Xishu area for sheep hunting.