Their size is too small compared to those gray wolves and grizzly bears, and they can only rely on their huge numbers to kill one after another gray wolves and grizzly bears.

For every gray wolf killed, hundreds of thousands of vampire bats will die.

Such a death rate is still too much to bear even if the number of vampire bats is extremely large.

Therefore, after the gray wolves, grizzly bears and other giant creatures were driven to the central part, the number of vampire bats was reduced to one-third of its previous size.

Under such circumstances, it is difficult for vampire bats to defend the territory they have captured.

Therefore, in less than a week, as the young wolves grew up and joined the battle, the battle line quickly moved towards the south.

Due to the huge population consumption, vampire bats are also evolving rapidly.

They soon evolved the hollow teeth used to suck blood to be sharper and harder. At the same time, they also evolved poison sacs at the corners of their mouths. These poison sacs secrete stored venom, which can be injected into the enemy's body through the hollow teeth.

Of course, the most critical point of evolution is that their reproduction rate has also increased a lot.

In the past, vampire bats gave birth to one cub a year, and occasionally gave birth to two. The cubs could cling tightly to their mother's abdomen and fly with them.

Fundamentally speaking, this greatly improves the survival rate of vampire bat pups.

Now, as the war against gigantic creatures continues to intensify, the reproduction cycle of vampire bats has rapidly shortened from the previous year to a week, and there are a large number of male bats taking care of their young, which allows vampire bats to give birth to one litter.

Give birth to 20 cubs and ensure a survival rate of over 95%!

Considering the already huge population of vampire bats, this is an astonishing change.

Countless vampire bats go out to hunt more food every day, including a large number of giant creatures.

With sufficient food supplies, the growth rate of those vampire bat cubs is also quite astonishing. They can often reach adulthood in half a month and then rush to the battlefield.

For giant creatures such as gray wolves, their reproduction rate is already quite high.

There is still a big gap when it comes to vampire bats.

And in front of vampire bats, it is difficult for giant creatures such as giant rabbits and rats to resist. When encountering groups of vampire bats, they will often become each other's meal.

Only two beasts, gray wolves and grizzly bears, can compete with vampire bats.

But with the rapid increase in the number of vampire bats, coupled with their harder and sharper teeth and venom, a large number of gray wolves suffered a devastating blow.

Even for giant creatures like grizzly bears, which have extremely strong natural defenses, only elite individuals over 45 meters in size can be completely immune to the crazy bites and venom of vampire bats.

So soon, a large number of gray wolves and grizzly bears were once again driven across the central Ugly Las Vegas.

This time, some vampire bats even raided the northern part of Choudras.

This reduced the overall number of gray wolves by more than 50% in a short period of time.

As for solitary animals such as grizzly bears, the losses are even more severe.

But giant creatures are not vegetarians either.

They are also creatures that have mutated under the influence of the strange fog.

Therefore, soon after suffering heavy losses, these giant creatures also began to evolve rapidly.

Creatures such as giant rabbits and giant rats with weak attack power continue to increase their reproduction rate, giving birth to more cubs, and the cubs grow faster.

The gray wolves and grizzly bears are evolving towards becoming larger and more defensive!

After all, gray wolves and grizzly bears are too large, and it is useless no matter how they increase their reproduction rate, because there is simply not enough food to satisfy the growth and development of their cubs.

On the contrary, after gray wolves and grizzly bears evolved in the direction of becoming larger and more defensive, their reproduction rate dropped rapidly.
Chapter completed!