Did you know

… some jellyfish are bigger than a human and others are as small as a pinhead?
… that jellyfish have been on Earth for millions of years, even before dinosaurs?
… jellyfish have no brain but some kinds have eyes?

What is a jellyfish?

The word jellyfish is a common term used to describe animals that are gelatinous or made up of ‘jelly-like’ material. There are many different types of jellyfish, including stinging kinds called medusae and non-stinging kinds called comb jellies or ctenophores. Another type of jelly animal called a salp is even in the same group as humans!


Fun and Bizarre Jellyfish Facts: 



Photo by Nadia Aly


1. They have no “sides”.

Jellyfish have no right or left side—only a top and bottom—as they are symmetrical around a central axis that runs the length of their bodies.

2. Jellyfish can clone themselves.

If a jellyfish is cut in two, the pieces of the jellyfish can regenerate and create two new organisms. Similarly, if a jellyfish is injured, it may clone itself and potentially produce hundreds of offspring.

3. They don’t need a respiratory system.

A jellyfish’s skin or tissue is so thin that the invertebrate can get its oxygen from diffusion, and therefore doesn’t need a respiratory system.     


jelly fish photo by Calvin Tang

Photo by : Calvin Tang


4. One variety’s tentacles can grow over 90 feet long.

The largest jellyfish species, the lion’s mane jellyfish (Cyanea capillata), can have tentacles that extend longer than a blue whale, the largest mammal on Earth.

4.They may be transparent, but that doesn’t mean they lack depth.

Jellyfish consist of three different layers, the epidermis, the gastrodermis and the mesoglea.

5. They’re more spineless than a politician.

Jellyfish are boneless, brainless and heartless, and most are transparent.

6. Most of them don’t live very long.

Most jellyfish live a relatively short life that ranges from a few days to less than a year. Some of the more minuscule only live for a few hours!

7. They have an awesome collective name.

A group of jellyfish is called a bloom, a swarm or a smack. A large bloom can contain 100,000 jellyfish.

8. They’re basically watermelons with tentacles.

Jellyfish are between 95% and 98% water.

9. Jellyfish don’t have brains.

Instead, jellyfish have nerve nets which sense changes in the environment and coordinate the animal’s responses.


jelly fish


10. Some jellyfish can glow in the dark.

Many jellyfish have bioluminescent organs, which emit light. This light may help them in a number of different ways, like attracting prey or distracting predators.




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April 11, 2016 |

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