What frogs can see still food

Because the eyes of a frog are unable to see (or cannot see clearly) stationary things, the eyes of a frog are different from the eyes of ordinary animals, they are specialized in looking at moving objects. The moth and the fly do not react to the frog's eyes, but as soon as the moth moves, the frog will immediately spot it and jump up to prey on it according to its flight direction and speed. It's no wonder that some zoologists joke that frogs like to eat flies, but that frogs can starve to death if they sit in a pile of dead flies.

The frog's eyes also have a special ability to recognize different images. It can instantly identify its favorite flies among the various shapes of flying critters, while the background of the flying critters is not responsive to the frog's eyes. In other words, the frog's eye is not like a camera, it can take pictures of everything in front of the lens without missing anything, and it only sees the things that are useful to it.

Frogeye can quickly spot moving targets, quickly determine the target's position, direction of movement and speed, and immediately select the best attack posture and attack time. The frog's eyes, lacking both the slight flutter of the human eye and the ciliary muscles to regulate the very prominent lens, are actually short-sighted, and it cannot see anything far away at all, even if the insect is next to it, it will not see it as if it were around. Only an object in motion can leave an image on its screen.

Categories: Science & Engineering.

Problem Description: Movement is relative.

Is it possible to see people standing still when it is jumping?

Resolution: It should be:

The frog's eyes are sensitive to things that move, but they are indifferent to things that don't move.

What are the structural characteristics of the frog's eyes that give frogs such strange abilities? After in-depth research, scientists have found that the retina of frog eyes is composed of three layers of cells: the photoreceptor cell layer, the intermediate contact cell layer, and the ganglion cell layer.

The photoreceptor cells in the first layer convert images of external objects into images on the retina and convert the images into electrical nerve signals. The second layer of contact cells is responsible for transmitting electrical signals to the third layer; The third layer of ganglion cells detects image features and codes these electrical signals to the brain.

Ganglion cells are further divided into four categories, each of which performs a specific detection function and only responds to a certain feature of the motor file target, identifying and extracting different features of the retinal image. In this way, a complex image is broken down into several easily recognizable features, improving the speed and accuracy of target discovery and identification. Therefore, scientists call these four types of ganglion cells "detectors", which are "edge detectors", "convex edge detectors" (also called "insect detectors"), contrast detectors, and "dimming detectors".

Together, these four detectors allow the frog to respond only to the objects that are critical to its survival.

The edge detector only reacts to the edges of the surrounding light or dark scenes; The convex edge detector only reacts to the curved convex edge of the scene that moves like an insect; contrast detector, which only reacts to changes in brightness; The Variable Signom Detector, on the other hand, only reacts to the decrease in light intensity, i.e., shadows. Taken together, the frog's eyes are particularly sensitive to both "fast-moving objects with rounded fronts" – insects that it likes to eat, and predators that are "fast-moving with large shadows". It does not respond to things that have no meaning to its existence, such as trees and blades of grass that do not move or shake.

It is not difficult to see that the frog's eye plays a role far beyond the scope of the camera that captures the scene without leaking a bit. The frog's eye can not only present images of the objects seen on the retina, but also analyze the images it sees, pick out specific image features, and then "communicate" to the brain through the optic nerve.

After the "meticulous carving" of nature, this visual inspection system of frog eye has reached a very perfect point. The frog's eye does not react to the background, instead focusing on objects that move relative to the background and have specific morphological characteristics. As soon as the "shadow" of an insect or predator passes in front of its eyes, it immediately reacts by pounceing on food or escaping into the water.

In other words, the frog's eye sees only what is meaningful to its survival. For example, the natural predators of movement and food are very important to its survival, and the pond is its habitat and is a meaningful sight for its survival. This characteristic of the frog's visual organ provides a design principle and model for the "moving target detector".

Summary. Frog predation relies primarily on their distinctive tongues and strong hind legs. Frogs usually use their tongues to catch insects, small fish, worms, and other small creatures, and their tongues are very flexible and sticky, allowing them to catch their prey quickly.

And the strong hind legs allow them to jump quickly and catch their prey that moves quickly. In addition, frogs also have very keen visual and auditory perceptions in order to better capture their prey.

Frog predation relies primarily on their unique tongue and strong hind legs. Frogs usually use their tongues to catch insects, small fish, worms, and other small creatures, and their tongues are very flexible and sticky, allowing them to catch their prey quickly. And the strong hind legs allow them to jump quickly and catch their prey that moves quickly.

In addition, frogs also have a very keen sense of sight and hearing, so they can better catch prey in the forest by concealing their information.

Can you tell us more about that?

When frogs spot their prey, they usually wait for a suitable moment and then leap up with their powerful hind legs and pounce on the prey. Insects and small fish in flight or swimming are often resistant to escaping such attacks. In addition, frogs can also use their flicking tongues to catch their prey.

The frog's tongue is very long and sticky, which can stick out quickly and quickly stick its prey to it. Frogs also possess very keen visual and auditory perceptions. Their eyes are particularly good for hunting at dusk or at night, as they can quickly adjust their sensitivity to light.

In addition, the frog's eardrum is also very sensitive and can quickly respond when it hears its prey approaching. Overall, the frog relies on its all-round hunting skills to survive and reproduce.

It is said that the frog's eyes have the peculiar function of not seeing anything that is stationary, but if something moves slightly, it can immediately sense it keenly. It is precisely by virtue of this peculiar skill that the little frog brakes statically, and uses its flexible and flexible tongue to stick the mosquitoes flying in front of it and send them into its belly.

Biomimicry has developed a kind of radar called "electronic frog eye" by using this function of the frog's eye, which is widely used in aviation, aerospace, civil, military and other fields, and has greatly improved the level of scientific development. The small frog eye has indeed benefited mankind a lot, and it is worthy of human gratitude.

This is the frog's eye in nature, and people have used its functions to serve humans. And there is a kind of frog eye in society, which needs to be further studied by humans. ......

The eyes of frogs are sensitive to things that move, but they are indifferent to things that don't move. A frog preys on as few as 50 or 60 pests a day as many as 200. 8. Can insects breathe?

In an environment with normal oxygen levels, insects breathe for a while and release large amounts of carbon dioxide, which then close the vents to block more oxygen from entering. In a digital environment with low oxygen levels, insects open the vent for a longer period of time and close it for a shorter period of time. This suggests that insects can actively respond to oxygen levels, and by opening and closing the vents, insects can keep their oxygen and carbon dioxide levels at fairly stable levels.

Because frogs know how to respect a dead creature.

Because frogs can only see what is moving in front of them.

This is determined by the anatomy of its eyes.

It can only capture moving things.

Yes, frogs come out at night to hunt.

Frogs can only live in water when they are young, and when they grow up, they can live on land. Frogs use their lungs to breathe, but they can also draw oxygen from the air through moist **.

The various pigment cells in it will also spread or contract with the high and low humidity and temperature, resulting in changes in skin tone. Frogs usually inhabit the grass along rice paddies, ponds, ditches or rivers, and sometimes lurk in the water, usually hunting at night.

Frogs can see at night, and frogs hunt at night.

The nerve cells of the frog retina are divided into five categories, one only responds to color, and the other four only responds to a certain feature of the moving target, and can transmit the decomposed feature signal to the visual center of the brain, the optic parietal cover.

There are four layers of nerve cells on the optic parietal cover, the first of which responds to the contrast of the moving target; The second layer extracts the convex edge of the target; The third layer only sees the perimeter of the target; The fourth layer is only concerned with the light and dark changes of the target's dark leading edge.

These four layers of features are like drawings on four sheets of transparent paper, stacked on top of each other to form a complete image. As a result, the frog can immediately recognize its favorite flies and moths among the various shapes of small animals that fly rapidly, and will not react to other things that are flying or stationary.

Yes, the frog's eyes are very strange, and it is very keen to see moving things, but it is almost impossible to see still things. As long as the insect is flying, no matter how fast it flies or where it flies, the frog can tell clearly; At the same time, you can tell when to jump up and eat the bugs. If the bug stops and doesn't fly, it can't see.

This is the conclusion that scientists have reached after a series of experiments, and there is no exact explanation for why frogs can't see stationary things.

Frogs are nocturnal, mainly using the stars and the moon, but when the weather is bad, the sun before sunset is very important! On average, a frog eats about 70 pests a day and night. So, of course, you can see frogs at night.

The frog's eyes are actually short-sighted, and it can't see anything far away at all, even if an insect is next to it. Only an object in motion can leave an image on its screen. Therefore, when people stand by the roadside and by the ditch, the frogs will not be frightened and run away; If people are walking around, they will see a lot of frogs jumping around.

Frogs have been living on Earth for two million years and are known as insect catchers.

Frogs use their bright eyes, jumping hind legs and dexterous tongue to catch insects and escape their predators. Frogs prey mainly on insects and mollusks, and there are percent of their diets.

Seventy or eighty are insects, and ninety percent of these insects are pests. A frog eats an average of about 70 pests a day and night, and can eat more than 15,000 pests from spring to autumn. So, we need to protect the frogs and not catch them.

Frogs don't have good eyesight, it's just that they feel with their sight. You should be aware of what migratory birds use to determine the direction when they migrate, right? It is to use the scenery of the sky to find the desired destination; Frogs are similar, using the sun, stars, and moon as a tool for judging.

Of course, frogs are nocturnal, mainly using the stars and the moon, but if the weather is bad, the sun before sunset is quite important! However, judging by the starry sky is only a general direction for frogs, and it is used for long-distance and long-term migration, not a matter of one or two days.

Frogs use the stars and moon to help determine direction.