From the time humans entered civilized society to 2021, a total of several thousand years have passed, and if you count from the beginning of the boundaries between human animals and other animals, the development of human beings has only passed 5 million to 8 million years.
According to scientists' estimates, the Earth is about 4.55 billion years old, and over the course of its long development and evolution, the early Earth has gradually stabilized, with suitable habitable zone locations, abundant liquid water, and an atmosphere that laid the foundation for life.
So about 3.5 billion years ago, the first prokaryotes appeared, that is, primitive single-celled organisms composed of cells without nuclear membranes, nucleolis, and only non-true nuclei of mimetic nuclei.
This prokaryote includes bacteria, cyanobacteria, etc., and its structure is very simple, only 1 micron to 10 microns in size, which belongs to low-level organisms.
About 2 billion years ago, the world had the first single-celled eukaryotes, that is, organisms with only one cell, although it seems very simple, they still have animal life functions, including movement, excretion, reproduction, etc., are the most primitive and lowest animals in the animal kingdom, such as grasshoppers, eye worms and so on.
It wasn't until 850 to 540 million years ago that the first multicellular eukaryotes appeared in the oceans, creating more complex forms of life that evolved into plants and animals.
In this way, from the emergence of the world's first real life to the present, there are about hundreds of millions of years of time, in such a long-term historical evolution, human evolution years are not worth mentioning at all, modern human beings want to understand the ancient creatures, explore tens of millions or even hundreds of millions of years ago, at present can only through the "fossil" method.
Under the long-term excavation and study of fossils by scientists, we have found that the marine life of the ancient period is beyond our imagination, and the ancestral forms that are completely different from modern animals show us a magnificent map of ancient creatures, including 5 kinds of very terrible ancient giant beasts, let's take a look.
The Dragon King Whale grew between 39 million and 34 million years ago, just after the fifth mass extinction, the dinosaurs were extinct, and almost all the creatures on land and in the sea were re-evolved and altered.
It is precisely because the dinosaurs that originally ruled the world for about 160 million years have disappeared, mammals have begun to grow explosively, gradually conquering the earth, and gradually consolidating their position in the Eocene, that is, about 53 million to 36.5 million years ago.
The Dragon King Whale grew in the middle and late Eocene, the warm climate is more suitable for animal breeding, and the dry environment makes many rainforest areas a plain with low forests.
As a result, the larger form of the individual became the direction of the development of animals, and the Dragon King Whale was one of the largest animals that evolved after the Cretaceous Period.
Scientists have found that the Dragon King Whale actually came to the sea from the early land mammals, and gradually became a marine animal, it has a short hind limb that has been degraded, which can hardly help its large body to swim in the sea, but it is enough to show its traces from land.
The average body length of the dragon whale is about 15 meters to 18 meters, compared to the modern whale form, it is more like a sea snake, with a very slender body, and swimming in the ocean is also similar to the general activity of eels, and even some scientists believe that the dragon king whale swims horizontally, and unlike other marine organisms can be three-dimensional.
At the same time, some people believe that the reason why the Dragon King Whale is so slender is because they lived in the warmer shallow sea in the tropics at the time, and there was no need to keep warm, so they did not store fat, so they looked very slender.
So much so that the Dragon King Whale was initially considered an ancient reptile, and was even given the name "Basilosaurus", or "Emperor Lizard".
The Dragon King Whale also lives up to its reputation as the largest sea behemoth in the Paleogene since the extinction of its dinosaurs, with very sharp teeth and a mouth full of fangs like a crocodile.
Based on the fossils found, scientists also found the remains of different fish, and even shark remnants, from the stomach of the Dragon King Whale, and through the analysis of the spear-toothed whale that lived at the same time as the Dragon King Whale, the scientists derived from the bite marks on its skull that the bite force of the Dragon King Whale exceeded 1600 kilograms.
Melville whales grew in the Miocene between 23 million and 5.33 million years ago, a period in which the flora and fauna framework is very close to modern and almost certain in the future direction.
In 2008, scientists first discovered the fossils of a new type of ancient sea monster from Peru, and restored it, because scientists like to read the novel "Moby Dick", in order to commemorate the author, the species name paid tribute to the author's name - Herman Melville, named the ancient beast Melville Whale.
The first fossil of melville whale skull found is 3 meters long, it is also the only fossil of this ancient behemoth found so far, scientists can only speculate based on the skull, according to their estimated length of about 13.5 meters to 17 meters, much longer than the great white shark, but shorter than the modern sperm whale, but its size is similar to the latter.
Unlike modern sperm whales, which are more functional, with tiny teeth growing only in the lower jaw, and even mainly sucking on cephalopods such as octopus and squid, Melville whales are likely to be the top predators in the ocean at that time.
Melville whales have 36 cm long teeth, and these teeth are like daggers, all over their large mouths, the upper and lower jaws are full of giant teeth, and the fossil teeth found are also the largest surviving whale teeth.
Melville whales, like modern killer whales, often hunt large marine animals with a sharp tooth, perhaps feeding on other cetaceans.
The dragon lived in the middle and late Cretaceous period, and scientists believe it may have evolved from a smaller cliff lizard that originally lived on land to the ocean and evolved into a marine behemoth.
At that time, the upper dragons and ichthyosaurs were extinct, which made the development history of the canglong, although very short, but because of the progress to the later huge size, it filled the position of the top predators of the first two giant sea beasts, becoming the largest predator in the Mesozoic ocean.
Based on the scientists' research and analysis of the fossils, they found that the dragon lived near the shallow sea, with a very strong head, conical teeth, and a ring of inner teeth inside the upper jaw.
Because their jawbones are relatively tight between the bones, they cannot swallow the prey, and it is likely that they will use the jaws to firmly bite the prey, and then bite it off through a strong torque, or tear off the part that is easy to swallow.
So far, the smallest dragon found by humans is about 3 meters to 3.5 meters long, and the largest has even reached 17.3 meters, their bodies are like long barrels, and their limbs have become thick and short fin-like limbs in the process of evolution, with larger forelimbs, five toes, smaller hind limbs, and only four toes.
The dragon's tail is very strong, about half the length of the body, like a vertical oar, swinging from side to side behind it when swimming, similar to the crocodile we often see on tv in modern times.
Therefore, the short-term speed of the dragon is very fast, up to 48.3 kilometers per hour, but it cannot be chased for a long time, and it is more inclined to be an explosive predator like an "assassin".
Canglong is undoubtedly the most successful marine predator in the Mesozoic period, and its fossils have been found in almost many places, which is enough to show that it once dominated almost all of the earth's ocean areas, and even plundered competitors, including food.
But unfortunately, a meteorite suddenly hit the earth, and the dragon's position as the overlord of the ocean was buried in this disaster, along with the dinosaurs.
In fact, scientists have also found a giant squid living in the late Cretaceous period - tost giant squid, which is even larger than the modern king squid, but because the mollusk itself does not have a calcareous skeleton, it is difficult to leave a trace in the long history and be found.
The only fossil that can be left behind is its internal endoskeleton fossil, which looks like a sword, the main body of the upper section is oval, like a hilt, and the lower end is a slender protrusion, which is its "sword body".
Through restoration, scientists found that the Tost giant squid actually has a length of more than 10 meters, and almost half of the length is 10 tentacles.
Living in the ferocious and dangerous ancient ocean, even the Tost giant squid, which is more than 10 meters, is undoubtedly a link in the biological chain, which is both a hunter and a prey.
Scientists have found many fossils of tontas, such as the inner shell of a 0.6-meter-long juvenile Tost giant squid in the stomach of a 1.52-meter-long, choked-tock chalk, and even found traces of bitten dragons on the fossils of Tost giant squid.
Of course, although the Tost giant squid is not a top predator, it is also one of the few animals that can compete head-on with the dragon.
The last nature is the megalodon, which lived in the oceans between 28 million and 1.5 million years ago and is considered the most powerful creature since the development of the earth.
Like the Tost giant squid, the cartilaginous shark has little trace in history, and scientists can only find a few fossils.
As of 2013, the megalodon shark has only found some teeth and spine fossils, although no other parts of the skeleton fossils have been found, but according to the existing data, through analysis and deduction, scientists finally concluded that the largest megalodon shark is about 20 meters long, weighs 90 tons, and a "blood basin mouth" can even be about 3 meters long, which is the top predator.
Megalodon, as the name suggests, its teeth are very large and sharp, like serrated teeth, there are 6 rows, each row has 46, adding up to 276, the largest tooth fossil found so far is 17.8 cm long.
Therefore, megalodon sharks can easily bite their prey, and even bite the bones, and the bite force is the strongest predator known to mankind, about 110,000 to 180,000 cattle, almost invincible in the ocean world, until finally unknown reasons extinction, disappeared into the ocean.
In the long-term evolution of the earth, there have been a large number of species, and now, the remaining animals and plants have been turned over for an unknown number of rounds of evolution, so many powerful predators are difficult to escape extinction, human beings should maintain a sense of awe, live in harmony with nature, and develop together with living things, so that they can exist on the earth forever.