Jellyfish Facts | Facts about Jellyfishes

What is the largest sea turtle?

The leatherback is the largest sea turtle, and it feeds mainly on jellyfish.

Jellyfish have no brain, heart, or bones, and their bodies are about 95% water.

The "immortal jellyfish" can turn back into an earlier life stage when it's stressed, possibly letting it avoid dying of old age.

Jellyfish have existed for more than 500 million years, long before the dinosaurs.

Box jellyfish have 24 eyes.

The lion's mane jellyfish can have tentacles more than 100 feet long.

A group of jellyfish is called a "smack" or a "bloom."

Peeing on a jellyfish sting is a myth and can make it worse. Vinegar is recommended for some stings, like those from box jellyfish.

Jellyfish were sent to space aboard the Space Shuttle Columbia in 1991.

A glowing protein from the crystal jelly led to the 2008 Nobel Prize in Chemistry.

Jellyfish aren't fish, so some scientists prefer to call them "sea jellies."