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World Jellyfish Day

Animal · Nature · November 3

A day for jellyfish, the drifting, brainless, surprisingly old animals of the sea, and for learning how they live and why they sting.

World Jellyfish Day falls on Tuesday, November 3, 2026. That is 7 days away.

Jellyfish have no brain, no heart and no bones, and they get along fine. They are soft, mostly water, and they move by pulsing a bell-shaped body while trailing tentacles behind them. Jellyfish Day gives them a turn in the spotlight, and it is marked in the United States as well as in other countries.

Most jellyfish drift with the currents more than they swim against them. Their tentacles carry stinging cells that help them catch small prey like plankton and tiny fish. That same sting is why beachgoers keep an eye on the water. Some species glow in the dark, and some are nearly transparent, which makes them look less like animals and more like weather.

People often mark the day at aquariums, where jellyfish tanks tend to draw a quiet crowd. Watching them under soft light is calming in a way few exhibits manage. Others read up on the many kinds, from tiny ones smaller than a fingernail to large species with long, trailing tentacles.

Despite the name, jellyfish are not fish at all. They belong to a group of animals that includes corals and sea anemones. If you find one washed up on a beach, leave it alone. A stranded jellyfish can still sting, even when it looks like a puddle of clear gel.

Ways to celebrate

• Visit an aquarium and watch the jellyfish exhibit for a while.
• Look up photos of glowing jellyfish species.
• Learn to tell a few local jellyfish apart before a beach trip.
• Draw or paint a jellyfish from a reference photo.
• Help a beach cleanup so less plastic reaches the ocean.

Dates

All national days on November 3

Also on November 3

• National Sandwich Day
• Cliché Day
• Give Someone a Dollar Day
• Election Day
• National Housewife Day

Categories: Animal daysNature days