Fun facts about jellyfish - did you know they aren’t even fish at all?
- Jellyfish evolution predates true fish by at least 100 million years.
- There are at least 1,500 different species of jellyfish.
- Their numbers are expanding even as ocean waters warm and become more polluted.
- Not all jellyfish can sting humans, but a few, like the box jelly, are lethally poisonous.
- A group of jellyfish is called a swarm or a bloom. Large blooms may contain millions of jellyfish and cover 10 square miles!
Now, some of our favorite types of jellies!
This is the largest known species, with tentacles as long as 100 feet.
Though it looks like one, it is not a jellyfish but a siphonophore, an organism made up of many highly specialized, minute individuals called zooids.
They tend to stay close to the surface of the water, making them easy prey for large fish, turtles, and the occasional marine bird.
Atlantic Sea Nettle:
Unlike other species of jellyfish that only eat plankton, sea nettles prey on minnows, worms, and mosquito larvae by stinging them with their powerful venom.
One Mediterranean species of jelly, the immortal turritopsis dohrnii, can return to its immature stage again and again after reproducing, meaning it may be able to live forever!