The species on Earth have many instincts, and reproduction is the most basic and important instinct. Otherwise, any species will soon perish and will not survive until today.
Reproduction requires males and females to complete together. The animal world is achieved through mating or mating. There are thousands of species on earth, and the mating time varies greatly. Do you know which species has the longest mating time?
is not bag shrew !
Although bag shrews are small in size and are only the size of a mouse, it is known for their long mating time. The bag shrew is a mammal and looks very similar to a mouse. Although it is very small, it is actually very fierce.
Such an inconspicuous species is famous in the animal world because of its long mating time. When the male bag shrew went into estrus, the androgens rose sharply, completely controlling the brain of the bag shrew, and even until the final death.
Bags of shrews usually only have three years of life. Even if it is so short, in order to have sufficient mating time, the bags of shrews can even be eaten or drunk, and the single mating time can reach 14 hours!
Such crazy behavior can also lead to serious consequences. After each estrus period, a large number of male bags of shrews will die. Even so, the shrew is still enjoying it.
Male pouch shrews have sperm from birth, but they can only be produced once in a lifetime, so sperm is very precious for pouch shrews. They must reproduce as much as possible through long mating!
There is another thing that makes people absolutely incredible. Due to the crazy behavior of male bag shrews, their number has become smaller and smaller. In order to give their offspring more sufficient food, many bags of shrews will choose to commit suicide and use themselves as food for their offspring to eat so that their offspring can survive better!
It can be seen that the reproduction strategies between different species in nature are very different.
Humans and bag shrews are both mammals. Different bag shrews reproduce and adopt the parenting bag method, just like kangaroo , while humans adopt the 10-month pregnancy method.
This is because during the evolution of humans, the body structure of women will change accordingly. In order to walk upright, the female pelvis will narrow the birth canal opening.
At the same time, bags of shrews can only produce sperm once in their entire life, which is extremely precious. They can even sacrifice their lives to reproduce. Theoretically, humans can produce countless sperm in their lifetime, and they will not sacrifice themselves in the process of reproduction.
Also, small bags of shrews can support themselves after they are born. Human babies cannot do this and need meticulous care from their parents to grow up.
In short, during the evolution process, each species has evolved its own unique reproduction strategy and has different reproduction and survival rules. After humans entered modern civilization, more and more people were no longer bound by the instinct of reproduction and had more choices and could choose different lifestyles.
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