There is an animal that everyone is very familiar with, living next to the stream or river, next to the farmland is also common, that is frogs, for the frog species, the most familiar is the people who have lived in the countryside, every summer after the rain or when it is raining, the frog's call will come in bursts, the place of residence by the side of the field or by the pond, at night when sleeping will always hear the name of the frog, at this time if there are many frogs nearby, as long as one starts to bark, Then it will be accompanied by more and more frogs began to chirp, dozens or hundreds of "croaking" calls non-stop, and even this sound you can clearly hear the call from a long distance away, so at night this sound is very disturbing, but some people like to listen to this call and fall asleep.
If you often go to the pond and the stream, I believe you must have seen what is in the pond, sometimes there will be a bunch of round and large creatures swimming around, and there is a tail, and the species you see is the offspring of the frog, also called the little tadpole, this small tadpole looks black, there is no foot, people who do not know it will not associate it with the frog at all, but they will be able to see it slowly after they grow up, they will slowly grow feet, the tail will gradually shorten, they will also come up from the water, At this time, you can see small tadpoles all over the pond, which are surprisingly dense.
But there is such a frog, you can not see their offspring, because their offspring are well hidden by them, let people be very surprised, this frog is "stomach frog", I believe many people have not heard of it, so where is its surprise reflected?
Strange parenting styles
Many people have this question, isn't this kind of stomach frog the same as ordinary frogs? How can the same frog be surprised? In fact, this amazing place is that it is different from the breeding method of ordinary frogs, our common frogs are to breed their offspring in ponds or paddy fields, but this kind of gastric breeding frog is different from them, gastrointestinal frogs are swallowed by the offspring into the abdomen to reproduce, so it is said that it is strange.
After fertilization of this kind of gastric frog in vitro, the female frog will swallow these large and small frog eggs into the stomach, and the stomach breeding frog is not the same as the common frog, frogs generally lay hundreds of eggs, and because these eggs are glued together, so it is also called egg blocks, gastric breeding frogs are only about 40 eggs at a time, but strangely, each hatching of the frog is only about half of the eggs, as for what is the reason? There are two ways to say this:
One is that when the female frog swallows the eggs, she does not swallow all the eggs produced, which leads to not hatching so many young frogs.
The second is that when the female frog swallows the eggs, some of these eggs are already digested in the stomach by the female frog's digestive system.
Then some people will wonder, since egg swallowing will consume the eggs, how can it keep the eggs from being digested? Isn't it different for other frogs in its stomach?
In fact, it is not, the stomach of the gastric frog is the same as other frogs, the difference is that the things wrapped in the eggs are not the same, the gelatinous substance surrounding the eggs of the gastric frogs is called "prostaglandin E2", this substance can make the swallowed eggs will not be harmed, because the stomach brotheling frog swallows these fertilized eggs, the material wrapped in the fertilized eggs will make the stomach of the gastroptid frog temporarily stop secreting hydrochloric acid, this substance can make the hydrochloric acid stop time is enough to make the fertilized eggs develop completely, so that the frogs will not be digested, after hatching the tadpoles, Tadpoles also survive in their bodies, while female gastric frogs will not eat anything when the fertilized eggs hatch or there are young frogs inside.
Because the growth time of the young frog is very long, the tadpole generally takes more than a month to develop and grow, plus the time of incubation, so at this time the stomach of the female frog will continue to expand, in order to give the young frog enough growth environment, and at this time the female frog in order to give the young frog enough space, they will stay in place to stay still, if at this stage of the young frog, the female frog is harassed or frightened, it will spit out the young frog, and when it spits out, it is already a young frog, Or when the tadpole grows into a young frog, it will be spat out by the mother, and it is already a real frog.
Stomach brooding frogs are extinct
Around the 1980s, the gastric frog has been completely extinct, the reason for the extinction is not clear what, but it is speculated that the cause of the extinction of the gastric frog may be due to the loss of habitat, or because of pollution, pathogens and parasites, coupled with excessive hunting, resulting in the decline or even extinction of the number of gastric frogs, in addition, chytridiosis is also one of the factors that may lead to the extinction of the gastroptial frog.
epilogue
Although in recent years, The University of Newcastle in Australia has been using scientific cloning technology to revive the stomach brothing frog, trying to resurrect this extinct species, but it is not satisfactory, after several years of experiments, they have used genetic tests to confirm that the dividing cells contain extinct frog genetic material.
If human beings do not love nature, there will be more and more species will follow the extinction, only by protecting nature, rare species can slowly appear in people's vision with changes in the environment.