For humans, pregnancy can last for 40 weeks. Spasms, enthusiasm, strange food craving, inconvenience increases and has many other effects. And 9 months of pregnancy is often the Jeonju of the actual drama. All of these pains and pains are good.
Scientists are still learning more about their birth time Fossil discovery In the South China Sea, 250 million creatures with embryos in the ribs have been released. that Dinocephalosaurus Fossils were Archosauromorph, a group that includes dinosaur and modern birds and crocodiles. Today, birds and crocodiles just lay eggs. However, most mammals offer vivid births except an runner’s copper and some snakes, lizards, fish and amphibians.
As a result of investigating some of the species of pregnancy, the human mother is not necessarily the worst. Some sharks and salon friends sometimes keep their fetus for several years before giving birth. So what animal has the longest pregnancy period? The longest period of time in the animal kingdom is:
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1. Golden Alpine Salamander Pregnancy Period: 3 years
The golden alpine Doramanger lives in the cold climate of the mountainous region in Switzerland. They have world records of Guinness during the longest pregnancy of the amphibians. Mother usually has young people for about three years before giving birth, but in some cases the post -period of this creature can no longer mean additional year.
Antonio Romero, a biologist of the Italian National Research Committee, said that it is suitable for a vivid era in a vivid age at a vivid age in a vivid era in this age. Study the species.
“Long pregnancy and vivid [the alpine salamander] This adaptation is closely related to historical glaciers because it provided survival in a cold and harsh environment, ”Romero says.
“Alpine salamander has developed pregnancy for many years because slow metabolism can reduce energy demand and maintain embryos for many years,” he said.
This does not always develop a comfortable and rearing environment. Romero says that at first there are several embryos in the mother, but some will spend the other for nutrition during pregnancy, and only one or two will be completely developed. Other amphibians, including fire Sala Manders, Lanza’s alpine Salamander, Hellbenders, Anderson’s Salamanders and OLM, can be longer than humans, depending on the weather, he says.
Read more: How to evolve throughout the history
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2. Frill shark pregnancy period: almost 3 years
Some sharks have evolved into vivid births, and some of them can last for a long time. Pril shark, also known as a lizard shark, I have a pregnancy period At least 3 years.
Many gills slit, strangely shaped mouths and eel, and deep sea sharks are relics of the past. Study on species of embryos.
However, this study found that some of the strange appearance of the shark occurred later in embryo development. The location of the jaw may not be the remaining characteristics of the past, but the latest adaptation and evolution.
This species is not the only shark with long pregnancy. Thorny The period of pregnancy lasts about two years.
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3. Elephant pregnancy period: 22 months
Elephants can be a champion mother of land walking mammals. Elephant embryos are 22 months of jean and young giant -the weight of the elephant is about 240 pounds at birth. Elephant newborns have relatively good cognitive skills, so they offer head starts in the brain department.
This long pregnancy may occur because there is a lack of other mammals in elephants. All mammals have a copper lute and are temporary sweat glands that remain even after the alphabar is released during the menstrual cycle. This sweat glands are attached for a while during pregnancy, releasing important hormones that help the embryo develop. Most mammals have only one of this opening, but the elephant 12 open According to a published study, during pregnancy Biological science.
The size increases as the embryo develops slowly. “Our findings show a very successful reproductive solution that is different from the current mammalic model.
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4. Orca pregnancy period: 15-16 months
Many of the other mammals in other long -term are maritime base, not land base. WALRUSES has a pregnancy for 15 to 16 months, and the whales of various species last for more than one year. Orca is one of the longest whale mothers and pregnancy lasts about 17 to 18 months.
In terms of weight, Oka produces calves while doing more than elephants in a short time. The weight is about 400 pounds. This long pregnancy creates a lot of time to work wrong in some orca population.
The hormonal research said more than two -thirds of Oka pregnancy in the southwest of the Pacific Ocean failed to fail due to many failures in the second half of pregnancy or immediately after birth. It falls to salmon population.
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5. Lizard and snake pregnancy period: 12 months
Most snakes do not have long pregnancy, but northern copper heads can be pregnant for up to nine months and have up to 10 descendants. On the other hand, some lizards can last a little longer.
For example, Brazil’s mavuya skin can be pregnant for up to 12 months. The female carries 2 to 9 embryos. Other skins may also have similar pregnancy, but Australia’s terrible tail lizards may be one of the most uncomfortable pregnancy. Their embryos grow until they become them The size of the mother is about one third of the size -Aroughly with a 6 -year -old human mother.
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Joshua RApp Learn is a DC -based science writer with a water -winning career. Overseas resident Albertan contributes to various scientific publications such as National Geographic, New York Times, Guardians, New Scientists, and Hakai.
