More than two hundred barbarian elephants are all third-level high-level existences, and some baby elephants that don't seem to have been born for a long time have also been caught by the Mulu King, but Rao is so, that also has a second-level advanced level, in the end, it is the largest animal on land, but the level is not comparable to other things.

And although those rhinoceros are a lot smaller than the barbarian elephants in size, most of them are third-level high-level existences, and some of the others are slightly smaller in size, which are also third-level intermediate existences, Zhou Fan did not hesitate to catch them one by one and throw them away, luckily, after two times, the first rhinoceros became Zhou Fan's pet, and at the same time added a little more experience to him.

Zhou Fan glanced at the system, Zhou Fan had worked hard to collect third-level animals over the years, and now he had gained a lot.

The third-level high-level red blood, the third-level high-level silver snake, the third-level high-level white tiger, the third-level intermediate lion, the third-level primary wolf king, the third-level primary leopard king, the third-level intermediate black bear, the third-level intermediate giant panda (I said earlier that the giant panda is not a little, and then think about it, it is better to add it, otherwise it will be a little troublesome to collect thirty kinds of third-level animals later, and the giant panda can also be regarded as a panda family, so modify it here), just caught in Hanzhong and swallowed alive by the giant python. The people of Yizhou raised it, and the third-level primary domestic sheep and the third-level primary cultivated cattle are larger than the usual cattle and sheep, the third-level primary Chinese alligator, the third-level primary baiji dolphin, plus the third-level high-level brute elephant and the third-level high-level rhinoceros.

There are a total of fifteen third-level animals, and the thirty species that can be upgraded are already half of the task, but Zhou Fan also understands that this kind of thing is definitely easy at the beginning, and the more difficult it is to go to the back. If you want to collect thirty kinds, it is definitely a long way to go.

However, what made Zhou Fan a little puzzled was that among so many brute elephants, Zhou Fan could obviously see a few brute elephants that were one size bigger than ordinary brute elephants. However, Rao is like this, they are only third-level high-level existences. It has not become a fourth-level or higher existence. Even the brute elephant who claimed to be the largest Dong Wu on land was only a third-level high-level, which really made Zhou Fan a little depressed.

The thirty kinds of third-level animals required for the upgrade of this three-level system have already made Zhou Fan so distressed, if it reaches the fourth level, does it need forty kinds of fourth-level animals, Zhou Fan already doubts whether he can find forty kinds of fourth-level animals on this earth.

Speaking of which, so far, the only animal above level 4 that Zhou Fan has seen is the giant python in Hanzhong Hanshan, and the others have never been seen again.

Zhou Fan also guessed. If the animal wants to reach level four, there may be two situations.

The first is by volume, just like the giant python encountered in Hanzhong, that is obviously this one, and it can become a fourth-level animal just by volume.

However, this kind of python is too rare on land, and the ordinary python is only a second-level high-level, and that one is obviously mutated, so it is possible to grow so big, like that of a giant python, Zhou Fan suspects that the entire Han may be just that.

But this is also good news for Zhou Fan. There can be mutated pythons in this world, and there can be other mutated animals, but this kind of thing is obviously very rare. It can only be a matter of luck.

Zhou Fan can't be sure if there is such a big animal on this land, but Zhou Fan can be sure that in the ocean, there are definitely animals above level four, such as the great white shark, blue whale, king squid and the like, in what volume, it must be above level four.

After all, the sea is the most mysterious existence. What kind of things are in it, even the technology of the later generations can't be explored. I wonder if just one ocean can gather enough for forty species of animals above level four.

But then again. Even the technology of later generations can't do these things, with Zhou Fan's current situation, don't mention it. With the current conditions, even going to sea is a luxury, and today's ships can't withstand such a big wind and waves at sea, let alone go deep into the sea.

This kind of existence that has become a fourth-level existence by volume, Zhou Fan can be determined, as for the other situation, Zhou Fan is just a conjecture.

As for the source of the conjecture, it was the third-level silver snake that the horn gave to him.

I have to say that this little silver snake is definitely a perverted existence, and its body length is only one foot, but just by virtue of its anti-heaven speed and toxins, it can become the most powerful existence at the third level and below the fourth level.

If Zhou Fan put the silver snake and a brute elephant together, Zhou Fan could be sure that the one who died must be the brute elephant, which was also a third-level high-level existence, but the lethality of the silver snake was much more powerful than that of the brute elephant.

If it weren't for the fact that the silver snake's toxin was limited, then it must be a fourth-level animal, which is really a pity, but after thinking about it, Zhou Fan was also relieved, if this silver snake was a fourth-level animal, Zhou Fan would not have been able to take it as a pet and have such a big killing weapon.

Therefore, if there is a snake that is faster than the silver snake, the poison is stronger, and there is no limit, or some other animal, maybe it may become a fourth-level animal, if you think about it with this mentality, it is not an impossible task to make forty kinds of fourth-level snakes, the world is so big, there is no wonder, you must go out and see if you have the opportunity.

As soon as he thought of this, Zhou Fan was also a fool, and smiled self-deprecatingly, it was useless to think so much now, he hadn't even collected all thirty kinds of third-level animals, let alone any fourth-level animals.

"Big brother, are you going to train these into cavalry?" Zhou Yu asked in a trembling voice, looking at those brute elephants and rhinoceros, his eyes were constantly shining. How could he not see with his eyes what kind of lethality these animals can cause on the battlefield. To put it mildly, such a cavalry is released into the field, I am afraid that before the battle starts, the soldiers and horses on the opposite side may have been paralyzed, and it will not be the end of the abuse by then.

"Yes, this is only the first batch, and there will be a steady stream of wild elephants and rhinos in the future." Zhou Fan nodded and said, and at the same time, he began to take all those brute elephants and rhinoceros as pets.

And Zhou Fan's temporary goal is also 500 each, to be honest, with the appetite of these brute elephants and rhinoceros, the materials needed to raise a 500-person elephant rider are enough to raise an iron rider of 10,000 people, but it is also worth it, I believe that this huge effort will definitely pay off. (To be continued)

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