The continent gathers near the equator, the warm climate, there is no predation and destruction of large animals, tall ferns grow luxuriantly, so that all kinds of plants on the surface grow unscrupulously, seize the ecological niche, the density between plants is extremely high, the spacing between trees is even less than 30 cm, under photosynthesis, plant growth consumes carbon dioxide, and spits out a lot of oxygen.

The full prosperity of plants has brought about a rapid surge in global oxygen content, due to the formation of lignin, and the fungi that decompose plants have not yet appeared, resulting in a large amount of carbon being solidified and deposited into the ground with the life cycle of plants, at the same time, the proportion of carbon dioxide in the atmosphere has decreased, and the proportion of oxygen has risen sharply, reaching the stage with the highest proportion of atmospheric oxygen in the history of the earth in the late Carboniferous period.

35% of the terrifying oxygen content, so that the size of arthropods quickly increased, giant spiders, giant horses, giant dragonflies, etc., crisscrossed the land, the world is invincible, no one can compete with giant insects.

At the same time, reptiles also began to appear, reptiles are very different from amphibians, reptiles have a hard shell of eggs and do not need to be born in the water, their skin is not like amphibians, only a thin membrane, but has scales, which allows them not to return to the water every once in a while, preventing dehydration, reptiles This advantage makes them quickly defeat amphibians to become the ruler of the land.

Behind the prosperity came the crisis, the mantle activity began to be fierce again, and the hot magma gushed out from the depths of the earth, reaching the coal seam and igniting it, and a pile of fires appeared on the ground, and then more and more flames appeared, and they burned down the trees.

Wildfires caused by underground lava are completely different from forest fires caused by lightning, which can penetrate the surface of the earth, smoldering without flames, and penetrate deep into the old carbon layer tens of thousands of years ago, releasing the carbon that was originally sealed by nature.

This fire is destined to become a catastrophe.

The ancient continent is not without fires, every year it is caused by lightning fires, dense plants compete with each other for living space, some plants have evolved special survival skills, their seeds, only with the help of the high temperature of the fire, can be opened and released, the fire even helps them sow seeds and sprout.

But this fire is different, the jungle surface rich in organic matter and carbon matter is like an extremely flammable "big briquette", the lava causes the fire to start a flameless smoldering, starting from the surface of the leaf litter slt, quickly passing through moss, leaf silt and all other organic matter deposited on the shallow surface of the forest and continuing downward, the smoldering can last for a long time because a large amount of combustible organic matter appears after the peatland dries out, such a smoldering fire is more likely to ignite the fire than a lightning strike.

The fallen burning trees ignited more trees, and soon, a sea of fire broke out nearby.

At that time, the extremely high oxygen content and the fire of dry wood accelerated the spread of the fire, which spread hundreds of kilometers away in a matter of days, and the animals in the jungle had nowhere to escape and died in the fire.

As forests were burned down on a large scale and food chains were broken, the surviving animals were quickly starved to death because they had no food sources, and the burning of coal produced a large number of harmful gases that gradually spread around the world.

These gases are causing a global warming effect, and the ambient temperature is rising rapidly, which makes it impossible for the eggs of marine animals to hatch and become extinct on a large scale.

Once again, life was hit hard, and animals such as giant horses, giant dragonflies, giant unicorns, and giant cockroaches were all extinct, and the era of giant insects was over.

Ratchey was lucky: she had lost only one of her legs, and her kind had been swallowed up by the dust of the ancient land of Gondwana.

Before the mass extinction, the ancient beast lived in a similar place to the coastal areas of other continents, with dense forests, rivers and lakes, and abundant aquatic grasses that supported herds of sawtooth dragons and dicodhats, providing ample food for mid-to-high predators such as lidonts and therocephals.

However, the supermantle plume event destroyed the world's ecosystems, the chaotic climate and ocean currents made the calm seaside area dangerous, and the ever-expanding death zone soon advanced to Lachi's homeland, where the water dried up, the earth cracked, the vegetation withered, the herbivores first starved of water and food, and then the large and small carnivores were also starved and thirsty—the vast majority of animals were thus buried in the promised land where they had lived for generations.

Only a handful of animals have attempted to escape the desert, including a group of weak-jawed beasts.

They chase their remaining prey, seek sparse oases, desperately grab territory and food, are preyed upon and driven away by other predators, and even kill each other, and in the midst of the displacement, only a handful of young animals successfully hatch and survive to adulthood, and Ratch is one of them.

No one knows what exactly Rage went through.

When she crossed the mountain pass that evening and appeared alone on the plain, she was no different from a walking zombie—

Hungry and dehydrated, she was horribly thin, like a dry animal skin stretched over a skeleton, her spine and ribs were sticking out, most of her hair had fallen out, revealing scarred cracked skin, and worst of all, one of her hind legs was missing below the knee, and even if she survived, she would have to limp for the rest of her life.

There was a silver river on the plain, and when he saw it, Ratche's eyes lit up, and the first thing he did was to rush to the river, and pour a belly of water into it, and then lay down on the spot, and slept until noon the next day.

After waking up, Rage begins to cautiously explore the place he had stumbled into. Ranwen

Although she is a large carnivore, in her current state, no matter how cautious she is, she can't be too cautious.

After carefully examining the footprints, carcasses, excrement, and secretions left by the other animals, and sniffing each pile of excrement, she was almost certain that there were no medium and large predators in the area that could match her, which was good news, at least for now, that she could make this woodland her domain for the time being.

But if she doesn't find food to replenish her strength as soon as possible, she will still collapse quickly and become a scavenger meal.

For Ratchey, there is no room for picking, and anything that can satisfy her is a matter of life and death.

For several days, Rakhi lived on beetles and larvae in dung heaps, as well as snails, centipedes, and scorpions under rotten wood, and the giant insects were extinct, and their surviving descendants were defenseless from the attacks of carnivores.

These low-quality emergency foods are not to the taste of this ancient beast, but they provide valuable protein and fat, and are relatively easy to come by.

After regaining some strength, the ancient beast would go a little farther away, looking for corpses and carrion, and picking up dead fish and shrimp on the banks of the river.

She also tried to catch some decent prey to open the meat, but was unsuccessful, the helmetodont escaped easily, the Claudio lizard hid in the water without waiting for her to get close, and the empty-tailed lizard jumped over her head as if to mock the lame hunter who had lost his home.

Only the anterior lizard was unlucky, as it wanted to curl up in the burrow to avoid predators, but Raki was a burrower himself, and the disability of his hind legs did not affect his burrowing efficiency.

It took the ancient beast two days to widen the passage, and finally arrived at the front lizard's quarters, tasting the long-lost taste of flesh and blood.

Once upon a time, Raki and his companions hunted the Inner Tooth and the Water Dragon, but now, Luck has been careful to keep his distance from the Inner Tooth herd.

She alone and lame could not hunt such a large prey, nor did she dare to raid the young individuals of the herd, for these large bales of straw were stupid and timid, and could easily run away when frightened, and if Ruchi was knocked over and stepped on or stabbed by fangs, she would have no choice but to die.

So that day, when Ratchey saw a hatchling of an inner tooth trapped in the mud by the lake, she trembled with excitement and wanted to pounce on it, slitting the throat of her prey with her sharp canine teeth, then tearing open the flesh and satiating the muscles and internal organs.

However, after all, Ratchey had the most developed brain in the animal kingdom at the time, and would not completely follow the instincts.

The ancient beast suppressed its strong impulse and quietly crouched in the two-toothed bush, until all the other inner tooth beasts left the river bank, walked away, and disappeared into the woods, and then slowly approached, ready to attack.

How do you know that the praying mantis catches the cicada and the yellow finch is behind, and suddenly a monster with a big flat head emerges from the lake, bites the little inner tooth beast, and drags it into the water hard, not taking the tiger-eyed Laqi in his eyes at all. Rage roared angrily a few times, but finally didn't dare to come forward to fight.

Looking at the slowly dissipating ripples on the surface of the lake, Ratchey's back seemed unusually lonely, and from then on, she would be especially careful every time she approached the water's edge.

However, the cautious Rage eventually got on his heels.

After a few days of rain in quick succession, Ratchey was patrolling his hunting grounds when he noticed a number of small bulges rising on the wet ground, and something seemed to be moving underneath.

Rachy paused curiously, trying to figure out what it was.

Soon, a round little head arched out, followed by a fat body, small limbs, and an unusually short tail, they came out one after another, completely without the consciousness of avoiding the enemy, crawling around, some arched directly to the feet of this ancient beast, and it didn't take long for many such little monsters to wriggle at the feet of Rakhi.

This ancient beast migrated here from a distant place, and it had never experienced such a scene, nor had it ever hatched like this, so naturally it didn't know what it was for.

These little monsters are a bit like the tadpoles she caught by the river, but not quite the same.

Rudge tried to fiddle with her feet, but the little monsters didn't run away quickly, didn't fight back, just writhed awkwardly and curled up in a ball, and the way they wriggled stimulated Lachi's urge to prey, so she lowered her head and easily grabbed one, bit it in a few bites, and swallowed it.