Let's talk about jellyfish, the mysterious creatures of the sea that seem to come from another planet.

In short, they can be defined as 'transparent jelly monsters', but if you look closely, these creatures are among the top survivors on Earth.

Jellyfish have been around for an astonishing 500 million years.

Whether a mass extinction event occurs or an ice age comes, jellyfish simply say, "Hmm? Okay. The water temperature must be a bit lower then?" and continue to thrive.

But how did they make that judgment without a brain?

It's just instinct. Pure instinct.

When you look at a jellyfish, you might wonder, "Is this really a living creature?"

95% of their body is water.

When you grab one, it's slippery, and when you let go, it glides away~ Thanks to their transparent bodies, they are excellent at hiding in the ocean, and when predators come, they just pass by wondering, "Where did it go?"

Truly, they are the "invisible kings of survival".

And their most terrifying weapon is their tentacles.

For plankton or baby fish, these tentacles are pure terror.

They wrap around carelessly and then sting!

In an instant, they paralyze their prey and digest them through their mouths.

But the problem is... that mouth also serves as an excretory opening.

After eating... yes, it comes out again through that same mouth.

It's a structure that makes life seem futile, but for jellyfish, it's a very efficient system.

Jellyfish are also flexible in reproduction.

They can simply divide to create multiple identical offspring, or if needed, they can change their sex to reproduce sexually.

It's like saying, "I want to live as a male this time?" and they become male.

Nowadays, jellyfish are thriving even more due to climate change.

When the water warms up, it feels like "Ah~ I'm in a spa~" for them.

As a result, they are appearing at beaches, causing damage to fisheries, and making beachgoers feel a sting on their ankles.

Now, scientists no longer just call jellyfish "ugly seafood".

They are studying the survival strategies hidden within their transparent jelly, the combination of toxins, and even species that are close to immortality.

Among jellyfish, there is the famous Turritopsis dohrnii, known as the immortal jellyfish.

It literally resets itself, "returning to its younger form when it ages".

Without a brain, without a heart, and with a mouth that is essentially a toilet, jellyfish embody the mysteries of life on Earth and the philosophy of survival.