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  4. 25 stunning photos of jellyfish in honor of World Jellyfish Day

25 stunning photos of jellyfish in honor of World Jellyfish Day

Despite their name, jellyfish aren't fish as all. They're actually invertebrates.

25 stunning photos of jellyfish in honor of World Jellyfish Day

In their young stage of development, jellyfish are called polyps and will sometimes form colonies.

In their young stage of development, jellyfish are called polyps and will sometimes form colonies.

While the Portuguese man o' war has similar aesthetic qualities to jellyfish and is also an invertebrate, it isn't a true jellyfish.

While the Portuguese man o

The bodies of jellyfish are 95% water.

The bodies of jellyfish are 95% water.

Source: Smithsonian

The life span of most jellyfish ranges from a few hours to a few months.

The life span of most jellyfish ranges from a few hours to a few months.

Source: Smithsonian

Some evidence suggests that jellyfish were around prior to the dinosaurs.

Some evidence suggests that jellyfish were around prior to the dinosaurs.

Source: Smithsonian

Because jellyfish are invertebrates, they don't have any bones. They're also lacking a brain​ and a heart.

Because jellyfish are invertebrates, they don

Source: Smithsonian

The little creatures have caused nuclear power plants to briefly shut down in Sweden, Scotland,​ the US, and other places by clogging their cooling systems. Though the incidents usually take less than a day to clear up, they can hold up the production of energy at the power plants.

The little creatures have caused nuclear power plants to briefly shut down in Sweden, Scotland,​ the US, and other places by clogging their cooling systems. Though the incidents usually take less than a day to clear up, they can hold up the production of energy at the power plants.

The nervous system of a jellyfish is the most simplistic​ in the animal kingdom, in part because of its lack of a brain.

The nervous system of a jellyfish is the most simplistic​ in the animal kingdom, in part because of its lack of a brain.

Source: Mental Floss

Jellyfish can asexually reproduce — meaning they don't necessarily​ need a mate to have babies.

Jellyfish can asexually reproduce — meaning they don

Source: Mental Floss

A group of jellyfish can be called a "smack," though "swarm" is the more common term.

A group of jellyfish can be called a "smack," though "swarm" is the more common term.

Source: Mental Floss

Over 60,000 jellyfish have lived in space, thanks to an experiment in which polyps were launched into outer space to test how they reacted to the lack of gravity.

Over 60,000 jellyfish have lived in space, thanks to an experiment in which polyps were launched into outer space to test how they reacted to the lack of gravity.

Because it can return to its polyp phase at will, the Turritopsis dohrnii jellyfish is thought to be theoretically immortal.

Because it can return to its polyp phase at will, the Turritopsis dohrnii jellyfish is thought to be theoretically immortal.

Jellyfish can range from sizes bigger than 2 meters in diameter …

Jellyfish can range from sizes bigger than 2 meters in diameter …

... to less than 2 centimeters in diameter.

... to less than 2 centimeters in diameter.

A jellyfish diet can consist of fish, shrimp, and small plants.

A jellyfish diet can consist of fish, shrimp, and small plants.

Some jellyfish can glow in the dark.

Some jellyfish can glow in the dark.

Jellyfish live all over the world and are found in every ocean.

Jellyfish live all over the world and are found in every ocean.

Over 2,000 species of jellyfish have been discovered.

Over 2,000 species of jellyfish have been discovered.

Source: World Atlas

All jellyfish sting, but some pack more of a punch then others. Some species like the Irukandji jellyfish are known for their painful, barbed stings.

All jellyfish sting, but some pack more of a punch then others. Some species like the Irukandji jellyfish are known for their painful, barbed stings.

Meanwhile, the sting of a box jellyfish can kill an adult human.

Meanwhile, the sting of a box jellyfish can kill an adult human.

Jellyfish can even sting you after they're dead.

Jellyfish can even sting you after they

Source: Mental Floss

It's a common misconception that peeing on a jellyfish sting can relieve the pain. In reality, it won't do anything to the wound.

It

A jellyfish's glow can help protect it from predators.

A jellyfish

Overall, these squishy animals are unique, ancient, and beautiful. There's plenty to admire about jellyfish — just make sure to watch your step if you see one.

Overall, these squishy animals are unique, ancient, and beautiful. There

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