Cats have been domesticated by humans for 3,500 years (but not as completely domesticated as dogs), and now they have become an extremely common pet in households around the world. Studies have shown that if cats do not eat mice, their night vision will be reduced and they will lose their ability to move at night for a long time. A study from the University of Heidelberg in Germany claimed that mice contain a substance called taurine, which can enhance the creature's night vision. However, cats cannot synthesize this substance on their own and can only supplement it by eating mice.

The cat's body is divided into five parts: head, neck, trunk, limbs and tail. Most cats are covered with hair, and a few are hairless cats. Cats have fat pads on the bottom of their toes, making them walk silently. It will not scare away mice when catching them, and has sharp claws on its toes. The claws can be retracted and extended. Cats retract their claws when resting and walking, and extend them when catching mice to avoid making noise when walking and prevent their claws from being blunted. Cats have five digits on their forelimbs and four digits on their hind limbs. Cat's teeth are divided into incisors, canines and molars. The canine teeth are particularly developed and sharp as cones, suitable for killing captured rodents. The chewing surfaces of the molars have sharp protrusions, suitable for chewing meat; the incisors are underdeveloped. Cats are agile and good at jumping. It hunts small birds, rabbits, mice, fish, etc. The reason why cats like to eat fish and mice is because cats are nocturnal animals. In order to see things clearly at night, they need a lot of taurine, and mice and fish contain taurine in their bodies, so cats not only like to eat fish and mice. He eats fish and mice, and he eats them because of his own needs.

In fact, cats’ vision during the day is much worse than that of humans. However, due to the unusual ability of cats’ eyes to collect light, coupled with their high-performance hearing and amazing concentration, cats can also see in the dark, and can even see light. The darker it is, the clearer the cat can see. The reason why a cat can see in the dark is because it has a well-developed cornea and its curved lens is much larger than that of humans. Therefore, the cornea of ​​the lens is located closer to the retina. In order to accurately focus the light, both As the curvature increases, more light can be collected.

Cat's eyeballs are shorter and rounder than humans, and their field of view is wider than human eyes. A cat's pupils can expand or close depending on the intensity of the light. Under strong light, the cat's pupils can shrink into a line, while in the dark, the cat's pupils can open wide and round. There are also reflective plates under the eyes of cats, which can reflect the light entering the eyes with about twice the brightness. Therefore, when the cat’s pupils are wide open in the dark, the cat’s eyes seem to emit a unique green or golden light when the light is reflected. , giving people a mysterious feeling.

Cats are color blind. Many scientists believe that cats can only see blue and green, but cats don’t care about colors. Binocular vision is very important for hunting animals like cats. Because it must be able to accurately judge mileage in order to calculate the distance to the hunting target. When the fields of view of an animal's two eyes overlap, a stereoscopic visual effect can be produced. The larger the overlapping range, the stronger and more accurate the stereoscopic effect will be. Cats' ability to judge distance is worse than humans but better than dogs. The overlapping range of the human eye's fields of view is much larger than that of a cat's eye, while a dog'sThe eyes are smaller than cat eyes. Cats are very clingy animals and they will remember your kindness.