Soon after Shao Xuan returned home, Lang Ga came over to inform him of the patrol, and each hunting team had a place in charge, and three groups of people took turns guarding it.

Participating in defense does not necessarily lead to dangerous things, but only serves as a precautionary role, after all, there are too many unknown factors in this big river, and it is always good to be prepared.

"They're going to start patrolling tonight, and you'll go with me tomorrow morning to change them. Langa said.

"Okay, I see, what do I need to bring?" asked Shao Xuan.

"You don't need to bring too much, just weigh the stone tools, and it will take half a day each time. Lang Ga pointed to a place under the mountain, "Right there, by the river, not far from where you used to fish." ”

"You probably didn't know when you stayed in the cave last year, but when the rainy season comes, the river will rise a lot, probably to ...... There. Lang Ga pointed to Shao Xuan.

There, there is a line of stones, and where this stone line goes down, there is not a single house in the zài.

Therefore, the people who live at the bottom of the tribe are only close to the bottom of the mountain, but do not build houses directly at the bottom of the mountain, which is the reason for the high water in the rainy season. The people who had been stationed near the river for fishing have all been evacuated and will not be near the river until the rainy season is over.

Thinking that Shao Xuan might not know what would happen in the rainy season, Lang Ga also specially told Shao Xuan about what happened in previous years, and when the rain outside was lighter, Lang Ga took Shao Xuan over for a turn, recognizing the place, and also made Shao Xuan mentally prepared. Although the place they are guarding will not be too difficult, they still need to be careful.

"In other words, the hunting team will not leave to hunt until the end of the rainy season?" asked Shao Xuan.

He had thought that he would just stay in the tribe for a while, and if there was no trouble, he would go hunting, but according to Langga, it meant that he had to stay in the tribe for the whole rainy season.

"This can't be helped, the tribe is such a rule, like many people on the mountain, they hoard a lot of goods, and the level of prey is also high, if they can survive, the mountain will be in trouble, even if they hoard some, but the level of those beast meat is not high, the energy provided is limited, and most of the time they will still be hungry, but!" Lang Ga smiled: "This is much better than winter, because during the rainy season, some things will come out, and we can pick them up and eat." ”

"Things?" Shao Xuan couldn't help frowning when he thought of the various insects that came out of the training ground, if he really had nothing to eat, he could only use them for the knife.

"You'll know when the time comes. Lang Ga also said too much, "Anyway, I won't die of hunger." ”

Well?

Shao Xuan is really curious now, listening to Lang Ga's words, it is not the kind of insect that came out of training, but something else?

"It's like this once a year, and although it may be dangerous, be careful, it's okay, don't worry. Lang Ga clenched his fist and hammered Shao Xuan's shoulder as a sign of encouragement.

Shao Xuan rubbed his shoulders and looked at the river in the rain.

From time to time, the overlords of the river will appear on the river in the distance. After observing those river dinosaurs, Shao Xuan had a doubt, those river overlords seemed to be going in one direction, which could be seen from their jumping movements. It's okay to say in individual cases, but all the dinosaurs that have come out of the water have their heads facing one direction, and there are no exceptions!

"Is that the upper or lower reaches of the river?" Shao Xuan asked Lang Ga as he pointed to the direction the river dinosaur was facing when it jumped.

"I don't know, I haven't been, it's too far. Lang Ga didn't care about the authentic words. For him, it makes no difference whether the river is upstream or downstream, and he doesn't think too much about it.

Shao Xuan looked in that direction, thinking about what the hell was over there, why those overlords in the river would head over there, the river was already big enough, if it weren't for the river being fresh water, at first glance I thought it was the sea...... Sea?!

Could it be that this is a river that flows into the sea?!

Shao Xuan recalled the situation of going out with the hunting team twice, speculated on the direction and terrain, and came to a conclusion, most of the current direction of the overlords in those rivers is the lower reaches of this big river, and if this river is really a river entering the sea, then why do the overlords in the river swim towards the sea in the rainy season?

Many fish species are subject to periodic directional movements due to factors such as reproduction, food, or overwintering, which are known as migratory characteristics, so are the overlords of these rivers also migratory behavior?

Shao Xuan shook his head, all of which was just a guess. Ask Langga and they won't come up with results, because they don't know what the sea is.

Regardless of whether those river overlords were swimming in the rainy season or not, there was nothing they could do for the current Shao Xuan. However, after returning later, Shao Xuan will record these observed phenomena in his "notebook".

Shao Xuan had already cleaned out some animal skins suitable for recording and used them to record things, including those paintings he had seen in the cave before, and Shao Xuan also drew them from memory and hid them. If the skin cannot be preserved for too long, it will be reproduced on a slate when the time comes.

His gaze moved back from the giant beasts in the distance whose figures were not clear, and after staying on the river beach for a while, Shao Xuan suddenly said, "Langga, you say, make a few fish traps here, okay?"

Lang Ga, who was thinking about how much food he could get in the rainy season this year, was pulled back to his senses by Shao Xuan's words, and asked suspiciously: "Yuzha?"

"It's a thing made of sticks and nets to intercept fish. Shao Xuan gave a general description, and then continued: "I thought about seeing if I could use such a fish fence as a simple trap. ”

"Trap?" Lang Ga's eyes suddenly lit up.

"Actually, it's a very simple thing...... Shao Xuan took out the stone knife he was carrying with him and drew on the ground.

As Lang Ga, who also uses trap setting skills, as soon as he sees what Shao Xuan said, and then connects with these drawings on the ground, he can guess what Shao Xuan means.

Scared, Lang Ga regretted: "Why didn't I think of it before!"

Shao Xuan wants to make a simple trap of the fish fence, it is not difficult, and there is no need for other more precise settings, but it is the same as setting up the fish fence, using wood or stone pillars to make a fence, fence up, the fish fence is like a mosquito coil to roll inward, but some are circular involution, some are square involution, Shao Xuan wants to see the difference between these kinds, the only opening of this simple fish trap is towards the direction of the river.

Or make a pocket with a fish trap, such as the larger letter omega "Ω", unlike the former, this kind of opening faces away from the river, so that when the tide falls, the fish swimming in it will be trapped inside.

Unless the fish swimming in has a high IQ, it is generally possible to trap some, and Shao Xuan tried it in his previous life.

It's just that because Shao Xuan has not participated in the patrol of the tribe in the rainy season, he doesn't know if he can add such a setting at this time, so he asked Lang Ga.

"Yes, yes! No problem at all!" Lang Ga looked at the river that had not yet begun to rise sharply, and called Shao Xuan: "Let's hurry up and find the stones, and set up this set before the river rises!"

Because some things in the river eat wood, you can't use wood to set up fish fences, but only stones, but when you don't pay attention to stone, it is easier to make stone pillars for making zuò fish fences.

So, when Mai came with the first group of people to start patrolling, he saw Shao Xuan and Lang Ga who were busy on the riverbank, and from the place near the river to the stone line set up by the tribe, there was a fish fence at a certain distance.

Because the time is too urgent, and the beauty is not exquisite, the thickness of the stone pillars is not uniform, and a few stone pillars are even as thick as thighs, and people can stand on them steadily