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Why do tigers look like cat gods? Help!

Evolution is a long process, not an instantaneous evolution. But in the long river of history, it is nothing to say so. The evolutionary characteristics of cats When people see this topic, they will immediately think of cats. Indeed, due to human domestication, wild cats have become domestic cats. Its soft fur, delicate sound, ability to catch mice and obedient attitude towards people really make people like women very much. But here we are talking about cats, not just cats. If the cat is magnified 100 times, I am afraid that not many people like it, but many people are afraid of it, because it is no longer a cat, but a tiger. Cats, lynxes, leopards, tigers and lions all belong to Carnivora in animal taxonomy. These animals have the same characteristics as follows: round face, big brain and eyes in front, so they can see objects three-dimensionally and accurately distinguish the distance; Claw tips can freely expand and contract, walk silently, climb trees (except large animals), swim and run fast (cheetahs are the fastest land animals). With these characteristics, they occupy a great advantage in predation and naturally become the "king of beasts". The ancestors of cats are ancient cats that appeared at the end of Paleogene. Looking ahead, the ancestors of the early Cenozoic era were fine teeth, just like the ancestors of canines. In the early stage of evolution, ancient cats were almost the same in size as modern domestic cats. It didn't walk out of the forest like the ancestors of canines (lions and cheetahs came out of the forest very late), but developed in the direction of adapting to forest life: the claw tips at the ends of four legs evolved freely (cheetah's claw tips can't be retracted, which is an exception), and it didn't retract when walking, so it was padded with thick and big claw meat, so it walked silently without wearing claw tips; The light in the forest is weak, and the light in the open field is strong. In order to quickly adapt to the change of light during exercise, it is necessary to adjust the size of the pupil. Cats have a strong ability to adjust. Take cats as an example. Their pupils are half open in the morning, narrowed into a line at noon and fully open at night. Because there is a film in their eyes, the weak light from the surrounding environment will gather at the fundus and reflect outward, so that people can see that their eyes emit fluorescence. This structure of eyes enables them to see clearly in the dark, so they can hunt at night. There are many obstacles in the forest. In order to reduce the scratching of the body when walking, the protruding part of the body should be narrowed as much as possible, such as the mouth is retracted, the length of the beard at the mouth is shoulder width, and the beard can not touch the hole, so the whole body can pass through; Small ears, only long and short hairs on the tail, etc. Because the forest is not suitable for fast running, its predation mode is different from that of canines, which chase prey by endurance. But hiding in streams and pools where animals drink water in the forest, waiting for their prey to pass by, jumping up, biting their throats and killing them. This kind of predation requires excellent jumping and flexible body. Students may have seen cats stretch. Its back is arched high, and then its waist is stretched out very long. This shows that the ligaments between the cats' vertebrae are loose. When running, the cat bows, and the front and rear limbs can get close enough, even the rear limbs can reach the front of the front limbs. When it stands up, the distance between its front and rear limbs can be stretched very long, so that it can catch up with its prey with great strides and fast frequency. In addition to ambush, it also uses the method of slowly approaching its prey and then suddenly attacking. This requires very good explosive power and strong jumping ability. For example, when a tiger jumps, it can jump over a 7-meter-wide mountain stream, and the time from standstill to running is quite short, that is, it accelerates quickly. Experts have calculated that it takes only 2 seconds for cheetahs on African grasslands to reach the speed of 50 meters per second, and the speed of half a minute can reach 1 10 km, which is beyond the reach of any herbivore. As mentioned earlier, the cheetah's claws cannot be retracted. In fact, the claw tips, like running shoes, speed up the pursuit of cheetahs, which is the result of cheetahs' long-term adaptation to sneak attack and predation. This is when the cheetah is chasing, holding its breath. If it doesn't catch its prey after half a minute, it will automatically give up and stand in the same place panting. Cats' teeth are smaller than those of canines in evolution, but the upper and lower canine teeth are firm and slender, and the muscles between their chin and skull are well developed, which is extremely powerful when contracting, and can bite off the neck and bones of prey. Because molars (big teeth) are small, they don't chew bones, but only eat meat. In order to fully eat meat, a thick and thin barb has evolved on the tongue, which can lick the meat attached to the bone a little. If there is a cat at home, try to let it lick your hand. You will feel its tongue grinding your hand like fine sandpaper, which shows that cats eat more carefully than dogs. In order to approach the prey in a hidden way, there is also a "camouflage suit" on the body, which further improves the success rate of predation. Compared with canines, we might as well make an interesting analogy. Cats, like smart people, always eat delicious food, while canines, like fools, eat everything when they are hungry. Although cats are the most powerful and fierce carnivores, they must also abide by the laws of nature. Some cats that don't adapt to the changes in nature are finally eliminated because they can't keep up with the evolution of animals. Canine is a good example. But on the whole, cats are highly adaptable to the environment, which makes them fully developed. According to the size and living environment of cats, they are also divided into large, medium and small types with different living environments, such as lions on the grassland, tigers and leopards in the forest and cats on the plains. No animal can be their enemy, even wolves should be afraid of three points, let alone attack them. However, from the practical point of view of human beings, the evolution of cats is not perfect. As mentioned above, they lack endurance, are not suitable for long-distance tracking, have a worse sense of smell than canines, and the food they feed is very fine and the cost is too high. Of course, people domesticated wild cats into domestic cats in order to let them catch mice. After the social material is extremely rich, cats have another purpose-viewing. However, in human society, canines are more widely used than cats.

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