Why frogs can only see living creatures

In order to figure out why frogs had to wait for moths to take off before attacking, bionic scientists conducted special experimental studies on frogs. It turns out that 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.

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.

Frogs are the name of creatures of the same order, so it is not possible to say in general terms that frogs will live for a few days without water, because there are many types of frogs.

Frogs are amphibians, and due to the large number of frog species, there is no way to say how long frogs can survive without water. Theoretically, frogs are amphibian species, ** of the cuticle.

The evolution will not be more complete, so the water protection in the body will not be too long, and reproduction is inseparable from the water source, so the frog should only survive for a short time without water.

Frogs use gills to breathe when they are tadpoles, and they must be in the water to breathe, and when they grow up to become frogs, they use ** to breathe, so they need to breathe, and they can't be in the water for a long time.

Depending on the climate, three to five days is generally fine.

For a long time frogs are amphibians.

As long as amphibians have something to eat, they can live normally.

You'll find out the next time you catch one.

People are amphibious, which means that they can live if they have water, and they can live without water. You say how long you can live.

01 The eyes of frogs are frog eyes, and the characteristic of frog eyes is that they only react to moving objects and cannot see stationary things, so frogs only eat things that move.

A frog's eyes cannot see anything still. The eyes of a frog are different from the eyes of ordinary animals, they are designed to look at moving objects, and moths and flies that do not move are unresponsive in the eyes of frogs. However, as soon as the moth moves, the frog will immediately spot it and, depending on the direction and speed of its flight, leap up to prey on its mouth.

It's no wonder that some zoologists joke that frogs like to eat flies. However, a frog would starve to death if it sat in a pile of dead flies.

The frog's eyes also have a special ability to recognize different images, and it can immediately identify its favorite flies among the various shapes of flying small animals, while the flying small animals are stationary in the background, but the frog's eyes do not react. 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.

What are the structural characteristics of the frog's eye? So that the frog has such a strange ability? 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 transmit images of external objects 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 moving 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.

Frogs live both on land and in water.

When I was a child, I could only live in the water, but when I grew up, I could live on land. Frogs use their lungs to breathe, but they can also draw oxygen from the air through moist **.

Frog habitat:

Due to ** exposure, they cannot effectively prevent the evaporation of water in the body, so they cannot live without water or a humid environment for a lifetime, and are afraid of drought and cold. Therefore, most of them live in tropical and temperate rainy areas, and there are very few species distributed in the cold zone.

When I was a child, I could only live in the water, but when I grew up, I could 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.