The next day, Lang Hua and the others were on their way back to the base.

In the afternoon, the sky in the distance is foggy, and it is estimated that it will get dark quickly today.

The sun is shining on the western horizon, and large snowflakes are fluttering in the wind. Most melt the moment they hit the ground, leaving only a small trace of wetness.

If the north wind had been stronger, perhaps the wet trail would not have lasted long.

However, there are still some shade spots where there are a lot of snowflakes. If this continues, after tonight, this provincial road will probably be white. And judging from Lang Hua's experience, this snowstorm will only get worse tonight.

The gusts of wind and snow hit the outer fabric of everyone's jackets, making a loud noise.

Lang Hua looked up at the snowy sky and muttered, "November...... It shouldn't be December yet. ”

"The first snow in 2275."

Lin Qian also sighed softly. In just half a month, they have experienced too many twists and turns. Looking back now, life before the catastrophe is still vivid as yesterday.

"Yes," Lang Hua nodded, "Coming a little earlier than usual." ”

Yang Xiaoxiao took off her hood and hurriedly interjected: "The second car parked on the eighth floor~"

Duan Hei also howled: "Took away the last falling yellow leaf~"

I have to say that the two of them are seriously out of tune.

But Xiaohezi and Yang Xiaoxiao didn't care. They smiled at each other after singing, raised their little hands and clapped their hands.

It wasn't until the next second that Lin Qian glared at them that the two living treasures put away their hippie smiles and shrunk their necks.

"Ah, I'll go. It's so cool, it's so cool! Yang Xiaoxiao suddenly jumped three feet high.

It turned out that a few large snowflakes had crossed her collar and landed on her neck.

Who made her just take off her hat?

Lin Qian couldn't hold back her face anymore, and laughed out loud.

Duan Hei was about to laugh, but was kicked on the ass by Yang Xiaoxiao first.

He rubbed his ass and balls, unhappy with the discrimination.

"Get out."

Yang Xiaoxiao opened his mouth to say a word, and Duan Hei immediately fled behind his sister Duan Qing, sticking out his tongue and grimacing at Yang Xiaoxiao from afar.

"The black fog of spores in the atmosphere lingered after the catastrophic change, which narrowed the temperature difference in winter, and the temperature was colder during the day and milder at night."

The spore community in the black fog will also promote the production of "condensation nuclei", so this early arrival of the "first snow" can also be regarded as a trace. ”

"Huh?" Yang Xiaoxiao listened to Lang Hua's explanation, and suddenly exclaimed, "Then aren't there black fog spores in these snowflakes?" ”

She rolled her eyes, made a dead fish-like appearance, and hurriedly said sadly: "It's over, I've lost a lot of it, I'm going to be infected." ”

After running to Lang Hua's side, Yang Xiaoxiao grabbed his sleeve and gestured to wipe his tears.

"Brother, what should I do~ You have to save me."

If you ignore these moods, the onlooker closes her eyes and listens, and her tone is quite cheerful......

Who knew that Lan Xi came forward diligently at this time, patted his chest and swore solemnly: "Xiaoxiao, I'm not afraid, I'll shoot off the snowflakes for you." ”

"Hey, don't...... I really don't need to ......" Yang Xiaoxiao twitched the corners of her mouth and hurriedly refused.

"You're my best friend, and I won't let you get infected with corpses. Deal...... If it's a big deal, I'll turn into a black corpse with you! ”

Lan Xi slapped Yang Xiaoxiao's long-sleeved hoodie even more vigorously as she spoke. The strength was so great that Yang Xiaoxiao almost wanted to vomit blood......

In the end, Lan Xi was done and ready to invite merit, but he got Yang Xiaoxiao's big eyes.

Please, sister.

Look at the atmosphere, ah, hey!

Lang Hua didn't care about Yang Xiaoxiao's careful thoughts, he rubbed the little girl's head and told her:

"It's not so scary. First of all, the proportion of black fog spores in the snowflake crystals is not high, but it is only an order of magnitude more than in the air. ”

"And there are countless black fog spores in the atmosphere, and these communities are extremely small, close to nanometers, and they are not visible to the naked eye at all." Chen Xinyan walked over and took over the conversation, "Normally, we inhale countless black fog spores when we breathe, and the exposed skin will also come into contact with countless spore communities. ”

She took off her hat completely, still wearing a white coat, as if she didn't care about the chill caused by the wind and snow.

"That's right." Lang Hua nodded.

Lin Qian made a point: "Then I understand, just like the human body is coexisting with all kinds of microorganisms." These black fog spores, which are in repeated contact with us, are not harmful to us. ”

"After Advent Day, we've all completed the evolutionary mutation, so we have some resistances? These foreign spores don't conflict with our evolutionary core, right? "The intelligence of the Lin family has been passed down in one line, and Lin Wenjin is also a very lively person, and he accepts new things very quickly.

"Yes. Except for the eruption stage of the black mist, these spore communities will be in a silent period with little activity. Lang Hua added, "In fact, for those who survived, if they deceive themselves to live, this unrecognizable world is not much different from before the catastrophe." ”

……

Within an hour or two, the snowflakes were already falling on the ground.

Lang Hua's evolutionary team, at this moment, more than twenty people were hiding behind a broken wall, lying on the cold snow and trying to reduce their sense of existence.

The broken wall is full of snowflakes on all sides, but there is some "fluttering" movement at the end of people's sight.

The distance is not close, about forty or fifty meters.

"What's that?" Duan Hei asked in a low voice, "Is it a corpse sparrow again?" ”

"No," Chen Xinyan stared intently into the distance, and then replied, "It's bats, a group of bats to be precise." ”

Lang Hua stood aside and didn't speak, it's not that he didn't see it. Just thinking the opposite, he saw it very clearly.

Among these people, except for Chen Xinyan, who has the ability to "microcosm", he Langhua has the highest level of evolution and the broadest vision.

He could see clearly, so it could see the "monsters" swirling in the snow.

With a wingspan of more than 30 centimeters, they are almost as large as the average pre-cataclysmic pigeon, completely exceeding the normal size of the average domestic bat before the cataclysm.

The forelimbs of bats are very well developed, and the upper arms, forearms, metacarpals, and phalanges are particularly long. After the cataclysm, ordinary bats evolved into mutant black beasts, with their five toes sharper and sharper than before, and they contain severe poison, which is a nightmare for ordinary evolutionaries.

"Brother Lang Hua, why don't they leave?" Yang Xiaoxiao poked Lang Hua's waist.

"Shhh ”

"Lost?"

"Bats, like dolphins and whales, use ultrasonic pulses to lock onto food in their path, and then connect with each other after determining the size and shape. When the bat aims at the food, the echo pulses surge and the food is captured. ”

"However," Lang Hua said, "In this kind of heavy snowfall, the 'impurities' in the air that hinder echolocation have increased dramatically, and it is difficult for the bat colony to adapt in a short time, so there is chaos." ”

"By the way", Lin Qian suddenly thought of something, "Aren't all bats hibernating?" How can they still appear now? ”

"No, there are many types of bats, and I remember that some of them live in the tropics without hibernation." Yang Xiaoxiao interjected, "It is said on TV that our northern bats hibernate because their food is mostly insects, and insects are dormant in winter or waiting to hatch in eggs, and bats can only hibernate if they don't eat." ”

As she spoke, it was as if she had discovered something, but she was barely able to figure it out.

"Xiaoxiao should have found out what the problem is." Seeing her appearance, Lang Hua smiled and said, "She is right, many hibernating animals are not afraid of cold, but because of lack of food, such as brown bears, they are hairy and thick, so they are not very afraid of cold." However, they live near the Arctic Circle, so they don't have enough food, and spend most of their time every year eating and storing fat except for hibernation. In winter, food is hard to find, and it is often a waste of energy to find food with only a little energy, and the gains outweigh the losses. ”

Lang Hua spread his hands and said: "In order not to starve to death, they have to find a place to sleep, or lie still, so that the body's consumption is kept in a very low state, relying on the fat stored in the body to stay up and wait for the spring flowers to bloom, and in the long run, evolution has formed a habit of hibernation." Therefore, whether it is hibernation or summer hibernation, it is the result of the evolution of animals to adapt to their environment. ”

Lin Qian suddenly said, "You mean...... Are they preying? ”

"Perhaps." Lang Hua said ambiguously, "But whether they are hunting or lounging, they are extremely dangerous to us. Don't forget, it's a time of cataclysm, and insects may not be able to eat it in winter, but the blood of living people is much easier to find, hehe. ”

Lang Hua smiled like this, which made Lin Qian creepy.

"Don't scare her", Li Liping scolded with a smile, "Bats eat insects and are beneficial beasts." There are only a few varieties that suck blood and cannot be confused. ”

"That's true," Lang Hua said solemnly, "but the flesh and blood of the Evolvers contain abundant energy, which is indeed a great temptation for them. ”

"It's true." Yang Qinghuan on the side shuddered, "Before the catastrophe, I saw sheep eating meat, horses eating chickens and squirrels eating voles. No creature will refuse to bring its prey to the door......"

Hearing this, everyone looked at me, I looked at you, and there was a trace of horror in their eyes.

"Then let's go. They shouldn't find out about us," Chen Chong said in a low voice, "Didn't Lang Hua just say that the bat swarm has been disturbed by the environment?" ”

Hearing his words, Lin Wenjin immediately pouted: "Then you're good." Did you know that the echolocation of a bat is unusually accurate, and even at night, it can detect insects the size of a human hair at night when it can't reach its fingers? If you want to die, don't pull us. ”

Sun Gui said fiercely: "What are you afraid of, it's a big deal to fight with them!" ”

"How to spell? Think we're all hard-shelled turtles like you? We don't want to be poisoned. ”

"You! So what do you say to do? ”

"Be quiet, and lie down." Lang Hua reprimanded, "Let's wait for them to pass." ”

"Sister Xinyan, Xiaoxiao, for the time being, you will be on alert, and report the situation in time."

……

In the winter snow, it was freezing cold, and Lang Hua took the lead in lying in the snowdrift, staring nervously at the mutant bats in the distance.

In fact, since the discovery of the mutant bat colony, Lang Hua has been vigilant. However, what he was wary of was not the fangs and claws of mutant bats, or even the virulent sporotoxin that was enough to make a low-level evolutionary corpse on the spot, but an ability unique to mutant bats after the cataclysm - sonic attack.

When bats use their nasal cavity to emit ultrasonic pulses, the "nasal lobe", a baffle structure in front of their noses, undergoes various deformations of different sizes. The nasal lobes are structurally complex and composed of skin and connective tissue, which has a real-time effect on the directionality of ultrasonic movements, resulting in diffraction of rays, which in turn affects "vocalization" and echolocation.

In the research data collected after the catastrophe, mutant bats can emit ultrasound waves close to 400,000 hertz, and the speed of nerve reflex exceeds 600 km/s. This kind of ultrasonic penetration is extremely strong, and it is easy to obtain a relatively concentrated "sound energy", and the huge energy is enough to make the human bones do violent forced vibration and break.

It is important to know that long before the catastrophe, ultrasonic was widely used in distance measurement, speed measurement, cleaning, welding, stone crushing, etc. Its sonic energy can even destroy the bacterial structure and sterilize items.

And when the frequency of the periodic driving force is equal to the natural frequency of the object, the amplitude reaches its maximum and resonates in a way that even evolutionaries cannot bear.

Although the human musculature is already a pretty good shock absorber, facing a group of mutant bats is tantamount to hitting a stone with an egg!

However, the ultrasonic path of mutant bats is mainly reflection and refraction, and Lang Hua and they are now hiding in another direction, and there is a high probability that they will not be discovered.

In fact, Lang Hua is also gambling, betting that the catastrophic process of this world is still under his control.

Because he knew that three years after the cataclysm, there was a large-scale "group mutation" in the black beast race, which produced a large number of mutant species within each race.

Among them, there is a kind of "secondary bat" in the mutant bat group. This kind of "secondary bat" is scarce in number and can emit infrasound waves with a frequency of 10~15 Hz. Infrasound waves are not easily attenuated, and their longer wavelengths allow them to diffract around some large obstacles.

However, the sound wave diffraction of the "secondary bat" is very coincidentally similar to the vibration frequency of the organism organs, so it is very easy to resonate, interfere with the normal function of the nervous system, and can cause dizziness, nausea, vomiting, loss of balance and even mental depression. Stronger infrasound waves can also cause deafness, coma, insanity, and even death.

In Lang Hua's memory, the most terrifying thing is the "Infrasound King Bat", which can easily make people within the diffraction range fall into frenzied hallucinations and cannibalism in a short period of time, which is very terrifying. The "Infrasound King Bat" has little intelligence, but it passively produces secondary disasters wherever it goes, and in the later stages of the catastrophe, various gathering places are miserable.

……

"Brother, Sister Xinyan said they had flown away."

After listening to Xiaoxiao's report, Lang Hua raised his head from the snow.

"Flying away?" He finally confirmed.

"Yes." Yang Xiaoxiao blushed and was a little surprised, "They didn't fly at us." When the wind and snow were lightened, I flew straight to the south. ”

It seems that the little boy and girl were not lightly frozen this time.

"Xiaoxiao, thank you for your hard work." Lang Hua said distressedly.

He stood up and breathed a sigh of relief at the people around him: "We escaped this time. ”

"A catastrophe?" Chen Xinyan's expression was a little puzzled.

Lang Hua shook his head and signaled that this was not the place to speak. The wind and snow gradually stopped, but the temperature was frighteningly low. Stuck in the snow for most of the day, the team now urgently needs a camp to warm up and rest.

Lang Hua looked into the distance, and then said: "There is a gas station in front, and I will camp here tonight." We'll wait until tomorrow when the snow stops. ”

After he finished speaking, he patted the snowflakes on his body, and then took the first step.

But Lang Hua had just pulled out his feet from the snow and took two steps forward, but he suddenly felt that his eyes were dark.

"Boom."

In his last conscious consciousness, he heard the sound of himself falling to the ground.

"Lang Hua!"

"Brother Lang Hua, what's wrong with you?"

"Aunt Ping! Aunt Ping, come on, he has a lot of blood from his nose. ”

……