Ye Feng understood clearly that the mutation of these animals, with their increased body size, was only one direction of evolution.
Much like his allocation of points, there were three choices.
And at the moment of breakthrough, just for the tree roots, there were four enhancement directions.
These animals presumably were the same.
But the vast majority of animals lacked intelligence, and they would only follow their instincts to become stronger.
In the animal kingdom, the larger the body size, the stronger the power naturally implied.
The mutated Big Yellow Dog before him likely had different thoughts.
Its direction of "enhancement" might not be enlargement, but rather might lean more towards speed.
Thinking of this, Ye Feng promptly drew out the second and third tree roots, aiming to entangle Big Yellow Dog, wanting to know its limits.
At first, Big Yellow Dog could indeed easily cope, but each additional tree root would double its difficulty to dodge.
When Ye Feng drew out the fifth tree root, it finally became anxious, or rather stopped dodging and began to counterattack.
As Big Yellow Dog once again dodged the whipped attack of the tree root, it lunged forward, mouth wide open, sharp fangs aimed at tearing the tree root.
It should be noted that Ye Feng had reached the Second Stage, and he had already reinforced the resilience of the tree roots twice, making them as hard as ordinary iron rods.
Logically, a First Order mutated animal shouldn't be able to harm him.
However, as Big Yellow Dog bit down, its sharp fangs instantly pierced into the tree root.
And with continuous biting, the tree root emitted a creaking sound, and finally, it was genuinely bitten off.
Ye Feng didn't care at all about the tree root losing a small section—rather, he was amazed by Big Yellow Dog's biting force.
"To be able to break through a Second Stage defense at the First Order, impressive," Ye Feng couldn't help but praise.
"I just don't know how its defensive power is?" While Ye Feng spoke, the five tree roots had already wrapped tightly around the Big Yellow Dog.
Of course, he didn't use full force right away, first tightening one tree root, then the second...
As two tree roots exerted force simultaneously, reaching 400 pounds of pressure, he suddenly heard a faint cracking sound.
That was the sound of bones being squeezed and breaking, accompanied by Big Yellow Dog's pitiful whimper.
"Compared to mutated animals of the same body size, the defensive power was slightly lacking. But combining such speed with attack power is already quite remarkable and worth focused cultivation."
After the test, Ye Feng nodded with satisfaction, simultaneously injecting spiritual energy to heal it.
Next, he began allocating points to himself.
Silently waiting for time to pass.
By 9 p.m., the King Cobra began its breakthrough to mid Second Stage.
Ye Feng calculated, realizing it needed 200 spiritual energy points to break a minor boundary in the Second Stage.
"The consumption is indeed much greater than during the First Order, but fortunately, I can support it."
Ye Feng watched the King Cobra's body grow from 10 meters to 12 and thicken a bit, feeling that such an investment was quite worthwhile.
Time continued to pass, quickly reaching midnight.
At this moment, Big Yellow Dog also broke through again, reaching the late stage of the First Order.
Its speed had once again increased, now surpassing that of birds flying in the air.
But what puzzled him was that the Mutated Buffalo, in which he had high hopes, showed no signs of movement.
"It shouldn't be, timewise it should also start breaking through," Ye Feng frowned, continuing to wait.
And in this wait, another hour passed.
"What's going on? Not enough spiritual energy within?" Ye Feng immediately extended a tree root to entangle his target.
Yet when he injected spiritual energy into the Mutated Buffalo, he found it reached its limit after only injecting 1.5 points.
"This... got stuck at a bottleneck???" At this moment, Ye Feng was full of questions.
At this moment, he understood his previous assumptions were wrong.
He glanced at the sparrow, mouse, bat, and black crow.
Self-talking, he said, "So, them being stuck at the bottleneck isn't due to their small size, but a normal thing?"
His gaze again fell on the King Cobra coiled under the tree, "And a King Cobra that can directly breakthrough belongs to those with extraordinary talent?"
Thoughts swirled in his mind, and in the end, he sighed, shook his head, and stopped thinking about it.
By now, it was already 1 a.m., and he couldn't wait any longer—he had to act early.
Soon, Ye Feng issued the command to set off.
The originally quiet forest resounded with a rumbling noise, mainly caused by the Mutated Buffalo's running.
Although it hadn't broken through to Second Stage, its current size exceeded that of a typical adult elephant.
Plus, the King Cobra wasn't suitable for long-distance travel, so it coiled around the Mutated Buffalo's back. The combined weight of these two colossal creatures made their run feel like a ground-shaking earthquake to other animals.
As for the other mutated animals, they hardly made any noise, the Big Yellow Dog running nimbly and lightly, with the Mutated Mouse carried on its back.
The remaining animals could fly and didn't make any noise at all.
Ye Feng was now possessing a sparrow, conducting remote command.
Other creatures were manageable, but due to the Mutated Buffalo's large body size, even at night, he dared not let it brazenly run along the highway, so he had it weave through the dense forest as much as possible to avoid detection by satellites overhead.
Yet even in such conditions, the speed of these mutated animals was incredibly fast. They covered a distance of over 20 kilometers in just half an hour.
When they were nearing the suburbs of Yang City, under Ye Feng's direction, they split up instantly.
The Mutated Buffalo remained outside, awaiting backup.
The King Cobra, mouse, and one sparrow formed one team—finding a sewer, they drilled in, advancing underground.
The remaining sparrow, in coordination with the bat and black crow, formed an aerial squad, primarily providing aerial views and directions.
He could sense the relative distance between these animals, guiding the three creatures in the sewer on their path forward.
Otherwise, how to proceed once the King Cobra entered the sewer would have left it groping in the dark.
Besides, on the ground, there was a Big Yellow Dog moving in coordination with the air squad.
At this time, neither the three small birds flying in the sky nor the Big Yellow Dog running on the ground would attract much attention on this quiet night.
Instead, the team advancing in the sewer felt the bustling excitement.
Here, advancing a short distance revealed swarms of mutated mice.
Not only mice, but the numbers of mutated flies and mosquitoes were also significant.