1. Because of the influence of the difference in life span between the two

Thousand-year-old tortoise:

During the Three Kingdoms period, Cao Cao wrote a poem called "Although the tortoise is long-lived", the first sentence in this poem is: "Although the tortoise is long-lived, it still has its time". It is proved that the tortoise is recognized as a long-lived animal in ancient times with the beginning of "although the tortoise is longevity". So what is the life span of the tortoise who is a brother with the tortoise?

Let's read another old saying: "A thousand years king is a turtle for 81,111 years". This sentence tells us that the life span of the tortoise is long, and of course "Millennium" should be an exaggeration here.

Turtles are very common in our lives, so what kind of animal is a tortoise? First of all, let me introduce you to this kind of animal. The tortoise generally refers to a turtle. Its eyes are relatively small, its ear holes are not obvious, its back plate is oval, and its length can grow to about 31 cm and its width can grow to about 21 cm in adulthood.

It is different from the tortoise in the following aspects:

1. The shell is different in hardness: the tortoise shell is hard and has various patterns, while the turtle shell is soft and has no patterns.

2. Different personalities: turtles are gentle, while turtles are fierce, easy to bite, and not easy to let go.

3. The body structure is different: when in danger, the tortoise's limbs and head will retract into the shell to protect themselves, but the turtle will not.

how long will this little bastard live? Is it true that "it's a thousand-year-old tortoise" as the saying goes? Since the tortoise is described as a thousand years old, its life span is naturally "extraordinary". The average life span of soft-shelled turtle is about 71 years, and the longest life span is 411 years old. According to research data,

Before 2116, there were originally three soft-shelled turtles in the world, one in Vietnam, two in China, and the one in Vietnam was captured by Vietnam, and no specific age data came out.

judging from the age of the above-mentioned tortoise, it is surprising that he can live to 411 years, although he can't reach the Millennium. It is said that long life is a hundred years old! This is a long life of several hundred years.

Ten-year-old duck:

Actually, I was born in the countryside. For rural areas, it is the most common thing for every household to raise chickens and ducks, but I have never seen an old duck that has been raised for ten years until it reaches its thirties. The oldest old duck I have ever seen is three years.

Last year, when I went back to my hometown for the Spring Festival, my mother pointed to a duck with black and white fur and told me that it had been three years, and its fur had changed from black to white. This is the oldest duck I have ever seen in my life. As for the ten-year-old duck, I have never heard of it.

So how long can a duck live? Ten years is a life limit for Brother Duck. It is said that ducks can only live for 5-8 years, and the average life span is less than 11 years, so it is almost impossible to find an old duck over 11 years.

Therefore, the contrast between the life span of a tortoise and that of a duck is too far away, and the common saying "A thousand-year-old tortoise is easy to find, but a ten-year-old duck is hard to find" has found its root. A tortoise's life is long, while a duck's life is short, which is the influence of the difference in life length. Second, the chance that a tortoise will live to an old age is greater than that of a duck.

1. Ducks are mostly raised, and wild ducks are rare now, so of course, the owner raises this duck for a purpose:

As far as I know, ducks raised in rural areas can be sold as long as three months, and the owner who intends to sell them doesn't want to keep them for a long time, because when the ducks are raised to a certain extent, they will be stereotyped and won't grow up again, but

for farmers who mainly make money, ducks that have been kept for too long will not make money at all, but will lose money. We can calculate how much food costs a three-year-old duck will spend: raising a three-year-old duck will consume about 511 Jin of food, and the rice is calculated as 1.5 yuan/Jin, which is 751 yuan, and the money for manual care in these three years is not included.

Therefore, ducks in rural areas will be sold in about a year, and they will be kept for less than three years, so the sold ducks will naturally become a delicacy on people's table. Because it can't bring economic value to its owner, it can only be sent to the slaughterhouse early, and the life span of ducks raised for this purpose is only one year. Therefore, ten-year-old ducks are naturally hard to find.

2. Although tortoise is also raised, it is widely distributed in rivers and lakes in China. It is not difficult to find an old tortoise stew, and sometimes it can be bought in the market. Ducks raised and kept in captivity naturally have no ability to decide and grasp their own destiny, and the tortoise who grows in nature is naturally a little more lucky, and the probability of living to an old age is much greater than that of ducks, so it is relatively easy to find an old tortoise. Third, the tortoise is widely distributed, and the lack of natural enemies ensures the growth of their ethnic groups < P > The tortoise grows in the fresh water of nature, and it is distributed in other provinces and cities except Xinjiang, Qinghai and Tibet in China, especially in the Yangtze River basin and Guangdong and Guangxi. The number is incalculable, and there are few natural enemies, and the number of breeding groups is huge. However, the number of ducks raised in free range is extremely limited, and its life span is only ten years, so ducks can't compete with the tortoise in both life span and quantity.

For farmers, the older they are, the less valuable they are. After being raised for three years, ducks basically don't like to lay eggs, and both meat quantity and meat quality will show a downward trend, but their food intake level has not decreased, that is, a large amount of food is needed to feed a duck that doesn't lay eggs, which is definitely a loss-making business for farmers.

Therefore, the life span of ducks is not long. Coupled with these external reasons, it is difficult to find old ducks that have been raised for ten years. Tortoise, on the other hand, has few natural enemies in nature, and its life span is many times longer than that of a duck. It is certainly much easier to find an old tortoise than a ten-year-old duck. This description is also an appropriate life phenomenon!