Is there an animal that was born with 4 legs, grew up with 2 legs, and later 3 legs?

Same as the riddle in the screenshot of the "Sphinx", the answer: people.

Explanation: When people are young, they can only crawl, four legs, and then learn to walk, two legs, and when they are old, add crutches, three legs.

The riddle is: "What animal walks on four legs in the morning, two at noon, and three at night?" When he has the most legs, it is also the time when he walks the slowest and his physical strength is the weakest. ”

Oedipus guessed the correct answer, and the riddle was "man".

This animal is a human, and when people are young, they crawl and walk, and when they grow up, they walk on two legs, and when they are old, they need crutches, so they walk on three legs.

Is it a human being, when he was born, he couldn't walk, so he crawled on four legs; Grow up and walk on two legs; When I am old, I can't walk, and I need to use crutches, which are three legs.

The animal you are talking about is a human, and a newborn baby can't walk, but crawls with both feet and hands; When the child grows up, he walks on his legs, and naturally he has 2 legs; When you reach an old age, you are an old man, and you need to use crutches to walk slowly.

Hello landlord, this animal you are talking about should be a high-level animal.

What you are talking about should be people, people are born to not walk to climb, so it is said to be four legs, when you learn to walk, it is two legs, and when you are old, it is three legs, because you have to add a crutch.

It's an old brain teaser, and the answer should be people.

Because after birth, the baby has to crawl on both hands and feet.

Grow up and walk on your feet.

If you can't go far, you have to use crutches, so when you're old, it's three legs.

Isn't it just a human being, when a person is born as a baby, he crawls with his hands and feet, and when he grows up, he only walks on two legs, and when he is old, he has to walk with crutches, isn't it just three legs?

This animal is a human.

People are just born to walk by crawling, and when they grow up to walk on 2 legs, the old man can't walk and has to walk on crutches, so he is a human.

There are many two-legged animals, such as: ducks, chickens, geese, ostriches, grouse, whirlpools, peacebirds, hairy-legged sandgrouse, and sand brings.

Sand finch, parrot, grass owl, hornbill.

Biting cuckoos, peacocks, crows, red-crowned cranes.

Seagulls, swallows, eagles, broad-billed birds, eight-colored thrushes, birds of peace, etc.

Two-legged animals.

Penguin is the general name for all species of the class Bird and Penguinidae. There are 18 species of penguins in the world, most of which are distributed and live in the Southern Hemisphere, and are typical bipeds.

Duck is a general term for waterfowl in the subfamily Duckidae of the order Duckidae, which is relatively small, has a short neck, two legs at the back of the body (like a swan), and a waddling gait.

Chicken, a type of poultry. Domestic chickens are derived from wild wild chickens.

Domesticated for more than 4,000 years, it is one of the animals that walks on two legs. The types of chickens are turkey, black chicken, pheasant, etc.

In our daily life, I believe that many people are very interested in natural science, so there are many children who like to be on TV since childhood** a variety of programs similar to the animal world and explain animals. In the process of growth and development, many friends will have a certain understanding of themselves and all the creatures on the earth, but there are also many friends who have a very strong confusion about the individual form of organisms. So why are there two-legged creatures in the world and four-legged creatures, and why are there no three-legged creatures in the world?

This question is actually very easy to answer, from the point of view of the body structure of animals, if there are three-legged creatures in the world, then it is likely to cause the creatures to encounter a lot of trouble in the process of walking. By looking at the two-legged creature and the four-legged creature, we can find that the two-legged creature is in a relatively balanced and coordinated state during the process of walking, and the four-legged creature will also carry out the left and right sides at the same time in the process of walking, so as to maintain a stable position.

Although the triangle is the most stable figure in mathematics, it does not mean that a three-legged creature can survive the most in the biological world. In fact, in essence, human beings were also four-legged creatures at the beginning, but because in the process of evolution, people used the last two legs more frequently, so people slowly learned to walk upright, so that they changed from four-legged creatures to two-legged creatures. Three-legged creatures will definitely encounter some obstacles in the process of walking, because this will cause the left and right sides to be in a very uncoordinated and unbalanced state, so they will be eliminated by nature.

So that's why there are only two- or four-legged creatures in the world, and no three-legged creatures, because this does not conform to the symmetry of the animal body at all, not only does it look very unsightly, but it will also be very uncoordinated in the process of walking.

I think the first is due to the fact that the genes of the world have been determined, there are only two legs and four legs, and mainly because the genetic elements of the animals in the world are developed according to a principle of symmetry.