"The bigger the body, the greater the consumption?" Shuimu murmured to himself thoughtfully.

When Mizuki asked about this, it wasn't because he was particularly concerned about Shino Aburame's progress in training. His parents were responsible for the learning of the family's secret arts. What Mizuki was concerned about was the problem of Shino Aburame's excessive consumption.

In the ninja world, there is a problem that has been ignored by everyone for a long time. Even Mizuki, who is in such an environment, has been distracted by other things and has not paid much attention to these issues. Although he feels that something is wrong, he does not care too much.

The problem that cannot be ignored is that due to the influence of chakra, the probability of biological mutation is very high in the ninja world, and it is not uncommon for wild animals to become ferocious and large. As a result, it is not difficult to accept the birth of some super-large creatures that are obviously beyond the tolerance of nature. As for those intelligent creatures that are so huge that they are terrifying, they did not attract the attention of ninjas. They were only regarded as summoned beasts and fighting partners.

It is true that the conditions in the ninja world are sufficient to give birth to these super-intelligent life forms. But is this really normal? Intelligent individuals and intelligent races are not the same concept. As long as Mizuki is willing to spend some money, it would not be a problem to significantly transform his giant bear Hata-kun and make it smarter than ordinary humans. However, it is almost impossible to create an intelligent giant bear race that can survive in nature.

The three sacred places for spiritual beasts, these magical places, breed two intelligent races, giant toads and giant snakes.

The Slug Sage in the Wet Bone Forest is too special and mysterious to mention for now; in the Ryuchi Cave, only Manda often appears in front of people, and there is too little information there, so the specific situation is unknown; there are many toads in Myoboku Mountain, including the three brothers Gamabunta, Gamaken, and Gamahiro; and the two brothers Gamaryū and Gamakichi are both Gamabunta's sons; above them are the Sage Shima and the Sage Fukasaku, and at the top is Gamamaru. Others include the Iron Arm Toad, the Scroll Toad, the Rock-Surrounded Toad, Gamachu, Gamari, and Gamaki, etc., which are obviously not individual intelligent creatures, but an intelligent race.

With this thought in mind, Shuimu stood up and said to Xiaochun beside him, "I'm a little anxious to eat. I'll go get some water. Wait for me, I'll be back soon."

After saying that, Shuimu walked to the backstage calmly without attracting anyone's attention.

…

In an empty lounge, Shuimu was holding a cup of water, deep in thought. An identical figure walked in and closed the door behind him.

"You heard it too, right? What do you think?" Shuimu asked with a trembling voice.

"Just like you think, I probably won't have a very different opinion on what you can consider."

Shuimu's original body frowned, watching the clone come forward, pick up the cakes that Shuimu had casually placed in the small bamboo basket on the table, and start eating. "It's really delicious!"

"If my guess is true, it would be really despairing."

Shuimu's clone ate and said, "A single leaf can block our view of the mountain. In fact, we should have noticed it long ago."

"Do you remember some of the biological research results from your previous life? Those so-called archaeologists who dig fossils everywhere every day have unearthed many insect fossils from ancient times. It turns out that the insects at that time were much larger than they are today. A millipede the size of a matchstick may have been larger than a snake hundreds of millions of years ago. Do you know what this means?"

Mizuki thought for a moment and replied, "There were indeed many large creatures in ancient times, but that was mostly the result of climate change."

"Climate?" Shuimu's clone smiled and said, "Maybe. There are also things like melting glaciers, rising sea levels, natural disasters, volcanic eruptions, and super-large meteorites hitting the earth. These are all difficult to prove. However, one thing is clear: in ancient times, the oxygen content in the air on Earth was much higher than it is today!"

"Do you know what higher oxygen content means? More efficient aerobic respiration can produce more energy and support greater physical consumption, which means the body can grow larger. Analogous to the ninja world, have you discovered anything?"

"The amount of chakra, or natural energy, is constantly decreasing, which can be fatal to large organisms because the external environment that supports their normal survival has changed."

This conclusion is not difficult to draw, and the entity can easily answer it.

"Like Gamalong and Gamakichi, when they were still tadpoles, they were easily summoned by Uzumaki Naruto's summoning technique; as they grew up, the time they appeared became shorter and shorter; their father Gamabunta would only be summoned when there was a fierce battle, and the same was true for the Manjusri in the Ryuchi Cave; Shima-sage and Fukasaku-sage would basically not appear unless there was a matter of life and death; as for Gama-sage and Snake-sage, there were legends that they were active in the ninja world in the past, but now they simply do not appear in the ninja world; as for the Slug-sage, whose size is so large that it is impossible to guess, the chakra stored in the Yin Seals of Tsunade and Sakura cannot summon it completely, so why do you think they grow so big if there is no need? Are they all waste otakus who like to stay in the so-called holy places and don't want to appear?"

Now that we have thought of this level, some questions cannot be avoided.

Competition and balance between wolves and sheep on the grassland. If a wolf runs slower than the slowest sheep, he will starve to death; if a sheep cannot run faster than the fastest wolf, it will most likely become prey and be eaten.

This is how nature maintains ecological balance, with competitors always maintaining the most efficient level of "just enough". If the wolf ran as fast as a rocket, it would either die of exhaustion due to excessive consumption and unable to replenish its physical strength by constantly eating mutton, or it would eat all the sheep and eventually starve to death.

"With such a big toad, there must be big insects that can feed it, big snakes and water birds that eat the toad, and giant eagles that eat the big snakes and water birds."

"No matter how big the slugs are, there will always be oversized hedgehogs or other creatures that feed on them. Otherwise, the ecological balance of nature will collapse because of this accident."

"But now, we can't find any trace of them in the ninja world. Maybe our ninja ancestors killed them as prey and ate their meat until they were extinct!"

The clone spread his hands and made an exaggerated gesture to liven up the atmosphere, but Mizuki's original self couldn't laugh at all.