In the cognition of ordinary people, only mammals generally produce milk, but can you imagine that a fish can also produce milk?
And it is actually the child's father who is responsible for feeding the child? The world is big, there are no wonders.
In the ancient Amazon Basin, there was a very primitive fish, the arapaima.
Not only can both the male and female produce their own milk, but after the eggs of the young fish hatch, the father is still inseparable from the child.
Responsible for feeding your child and keeping your child safe. So what did the child's mother do after giving birth?
The child's mother is not as patient as the child's father, and once the eggs hatch, the female leaves on her own.
The male, on the other hand, assumes the responsibility of a mother and needs to accompany the child for about three months.
It is not until the small arapaima acquires the ability to survive independently, as a father, the male will leave with peace of mind.
So where does the arapaima milk come from?
Scientists have found that the milk of arapaima is secreted by its inner ear, eyeball and central nervous system.
And it is rich in nutrients, hormones such as prolactin and immune proteins.
Like human milk, it is a white liquid.
An interesting phenomenon is that juveniles also often move around the head of the male.
From time to time, his own head will also have a close contact with his father's head.
This behavior of the juvenile fish is not deliberately naughty, but may just be to be able to drink more of their father's milk.
For juveniles, father's milk is delicious.
Why name this milk-producing fish Arapaima? As the name suggests, this fish is not only in the water.
Put into the human world, it is also a giant-level existence.
Arapaima is huge, and an adult arapaima is generally more than two and a half meters long.
Imagine how you would feel if you were standing next to a giant two-meter-five tall.
In addition to being large and able to produce milk, Arapaima also has other strange skills.
What do fish breathe? I believe that everyone will blurt out "of course it is a fish gill."
However, the Brazilian arapaima is different from ordinary fish and has lived in the Amazon Basin for so many years.
Arapaima has mastered the magical skill of breathing with lungs. Obviously an aquatic animal, why should you learn to breathe with your lungs?
This is inseparable from the environment in which the arapaima live.
As we all know, the Amazon Basin is the most pristine tropical jungle water in the world.
During the hot and dry season, the amount of water in the river is very small and slow, and the amount of oxygen in the river is very scarce.
But "natural selection, survival of the fittest" is an eternal and unchanging law of nature. Arapaima is not worried about lack of oxygen.
In addition to the gills, the arapaima has an additional respirator.
That's the kind of balloon that forms from the lobes of arapaima's lungs.
During the dry season, when the river level drops rapidly, arapaima also finds a way to drill a hole in the muddy riverbed.
In this cave, wait for the end of the long dry season and return to the river when the water level of the river rises again during the rainy season.
Everyone knows that bears hibernate, but who would have thought that fish would actually roost in summer.
It can also be seen that arapaima is really a smart and tenacious fish.
Arapaima is full of attack power, and brute force is its best weapon.
Its tail swings up, which can easily knock down a strong adult male, and seriously break bones and cause internal injuries.
It can be said that in terms of strength, arapaima is worthy of the "Schwarzenegger" among fish.
In addition to the attack power, the defense power of the arapaima is even more unique.
When it comes to piranhas, everyone is scared. But in front of the arapaima, the piranha can only "shout in vain".
The Arapaima has a natural protective armor, which is its huge thick scales.
The most common scales of arapaima are also 4-5 cm thick, and the thickest can even reach 10 cm.
Even if the piranha's teeth are bitten, it will not cause any harm to the arapaima.
The scale structure of arapaima has also been applied to related protective equipment such as body armor, which has produced greater value.
In addition to being able to inspire scientists to make body armor, arapaima has another attraction for humans.
That is – eat. The meat of arapaima is not only spineless, but also tender, nutritious and rich in protein.
In order to satisfy their appetites, people have fished for arapaima, and the number of arapaima has been decreasing.
Today, arapaima is an endangered species.
With the increase of people's awareness of the protection of arapaima, the farming industry of arapaima has developed in recent years.
However, the cultured arapaima is much tame.
The name "Schwarzenegger" in fish has also lost its original color.