What are jellyfish covered in?

Jellyfish aren't covered in anything in the traditional sense. They don't have scales, fur, or feathers. Their bodies are primarily made up of water (up to 95%) and have a jelly-like substance called mesoglea, which gives them their name.

However, they do have a thin outer layer called the epidermis that provides some protection and contains stinging cells called nematocysts. These nematocysts are what give jellyfish their infamous sting!

So, while not covered in anything like other animals, jellyfish have a unique structure that allows them to thrive in the ocean.