Why Don't Animals Wipe After Pooping, But Humans Can't?
This is a rather peculiar question, but worth considering. What do we do when we're idle at home? Whether it's raising small pets, 'food' kept at home, or seeing majestic lions in the animal kingdom, there seems to be a question: they don't need to wipe their bottoms after defecation? Whereas humans do. If someone defecates without wiping, it might be a problem. And if animals had this behavior, we'd also think it might be a problem, like a dog dragging its butt across the floor. They're not wiping their bottoms, it's because they're sick.
The Earth has a history of 4.6 billion years, and life on Earth has a history of 3.5 billion years. According to Darwin's theory of evolution, Earth's earliest life forms were simple single-celled organisms. Over a long period of time, through genetic mutations and variations, and influenced by environmental changes, suitable traits will be selected and inherited. Genetic mutations and variations continue to occur, and environmental selection has never stopped; this is the evolutionary process of life.
The kinship between species can generally be seen through biological classification, such as the pet cat you raise at home and the tigers and lions in the forest and on the grasslands, which can be traced back to 3.3 million years ago. Modern humans are descendants of Caucasians. If traced back to 600,000 years ago, they have a common ancestor with chimpanzees.
We can see that as life evolves and develops, the kinship becomes more and more distant, and survival habits are also different. Humans are the most special existence among all life forms because we haven't evolved sharp teeth or strong bodies, but we have evolved brains, learned to make tools, and use tools. This also brings some drawbacks, such as upright walking, which makes us constantly carry a brain shell, making us very susceptible to spinal and waist problems. Of course, upright walking also makes human reproduction more dangerous.
Upright walking is one of the main reasons why humans need to wipe their bottoms after defecation, which is very easy to understand. The human body structure causes the anus to be almost closed, unlike cats and dogs, whose anuses are exposed. If humans don't wipe their bottoms after defecation, in addition to being disgusting, it's also very easy to breed bacteria and harm health, especially for women. It's conceivable that the recognition or skill of human beings is achieved by sacrificing a certain number of individuals. This is considered from the perspective of evolutionary theory: during the transition from apes to humans, there must be a large number of individuals who are not accustomed to wiping their bottoms. As a result, they did not have the opportunity to be passed on, while those who mastered this skill had a higher chance of survival.
What was said above considers the difference between humans and other animals in terms of body structure. In addition, the diet and other life forms of humans are also different. That is to say, different life forms have different digestion of food, such as cows, which mainly eat coarse fiber, and the feces also contain a large amount of unabsorbed fiber. Such feces will not touch their bottoms. Of course, the cow's anus is exposed, and the wagging of its tail can also play a role in cleaning the anus.
In fact, there is also a kind of thing that many people don't want to accept, such as cats are very clean animals, they will hide from people when defecating, dig in the soil, and then bury it. But if accidentally touched some, they will really clean up, the method is to lick themselves, although it seems unacceptable, but people can't control it.
Furthermore, even if humans can be like animals and don't wipe their bottoms after defecation, it's healthy and doesn't get sick, no one will save those few tissues. Because this involves etiquette or face. If you don't wipe your bottoms, others will look at you differently.
Written by Du Luo, Image source network deleted. Welcome to follow us: Science Black Hole!
