Why do frogs hibernate?

Frogs are amphibians, and amphibians are cold-blooded. Their body temperature will be affected by the temperature, and as the temperature gets colder, their body temperature will gradually drop. When the temperature drops to a certain extent, the frog can't eat or move, and stays in sleep to avoid the cold, and then comes out to move after the ground temperature rises in the next spring. This is the reason why the frog hibernates. So hibernation is a survival method for animals to adapt to the cold external environment.

After in-depth study of frog eyes, scientists found that the retina of frog eyes consists of three layers of cells: photoreceptor layer, intermediate contact cell layer and ganglion cell layer.

Photosensitive cells in the first layer image the external scene on the retina and convert the image into neuroelectric signals; The second layer of contact cells is responsible for transmitting electrical signals to the third layer; The third layer ganglion cells detect image features and encode these electrical signals into the brain. Ganglion cells are divided into four categories, each of which performs a specific detection function, only responds to a certain feature of the moving target, and recognizes and extracts different features of the retinal image respectively. In this way, a complex image is decomposed into several easily recognizable features, which improves the speed and accuracy of finding and identifying targets. Therefore, scientists call these four types of ganglion cells "detectors", namely "edge detectors", "convex edge detectors", "contrast detectors" and "darkening detectors". Together, the functions of these four detectors make the frog's eyes particularly sensitive to "fast-moving objects with round front ends"-this object is characterized by insects it likes to eat, and it is also particularly sensitive to natural enemies with "fast moving speed and large shadows". However, there is no response to things that are meaningless to its survival, such as motionless or shaking trees and grass leaves.

Frog's eyes can not only present the images of the objects they see on the retina, but also analyze the images they see, select specific image features, and then "report" them to the brain through the optic nerve. Through the "exquisite carving" of nature, this visual detection system of frog's eye has reached a very perfect level. Frog's eyes do not respond to the background, but focus on the movement relative to the background.

Animals and objects with specific morphological characteristics. Once the "shadow" of insects or natural enemies passes by, it will disappear immediately.

Will react, jump on food or escape into the water.