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Jellyfish Day

Join the fun and discover how fascinating jellyfish are on Jellyfish Day! Get ready for a day of learning, smiles, and joy.

Tuesday

November 2026

Last updated February 7, 2026 · by the Holiday Calendar Team

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YEARLY DATENovember 3

OBSERVED INInternationally

CATEGORYAnimals

SUBCATEGORYWildlife

INTRO

Introduction

PHOTO

Get ready to celebrate Jellyfish Day on Nov. 3! This special day is dedicated to the amazing and mysterious creature of the sea - the jellyfish. For centuries, people have been fascinated by these creatures; they are graceful, colorful, and mesmerizing. Jellyfish come in many shapes and sizes, from tiny to gigantic, with beautiful colors that range from transparent to deep purple and blue. Not only are they a sight to behold but they also serve an important role in our ocean's delicate ecosystem. So join us in celebrating National Jellyfish Day and learn something new about this fascinating aquatic animal!

TIMELINE

Jellyfish Day Timeline

Jellyfish Appear on Earth

Appearing before dinosaurs and even trees, jellyfish are among the oldest creatures on Earth.

Scientific Study of Jellyfish Begins

In the 19th century, marine biologists began researching jellyfish, discovering their unique reproductive and survival methods.

First Public Aquarium Exhibit

The Monterey Bay Aquarium became the first to successfully keep and display jellyfish in captivity.

Major Climate Study Published

Research published by the National Science Foundation pointed to an increase in jellyfish populations as a potential indicator of climate change.

New Species Discovered

A new species of giant jellyfish, the 'lion's mane', was discovered off the coast of Australia, demonstrating there's still much to learn about these creatures.

Jellyfish Day Celebrated

Jellyfish Day is celebrated on November 3rd, encouraging people to learn about and appreciate these fascinating creatures.

GET INVOLVED

How to Celebrate Jellyfish Day

Go to an Aquarium

Visit your local aquarium and marvel at the jellyfish on display. Most aquariums feature jellyfish tanks, so go take a look and learn about these amazing creatures.

WATCH

Watch a jellyfish documentary

There have been many documentaries made on the fascinating life of jellyfish. Watch one and learn more about these unique creatures.

VISIT

Visit a beach

Visit a beach that is known for its population of jellyfish and observe them in their natural habitat. Make sure to bring a pair of binoculars so you can get a closer look.

TRY

Try some jellyfish dishes

Jellyfish dishes are quite popular in many cultures. Try some of the most popular recipes such as jellyfish salad, jellyfish stir fry, or even jellyfish soup.

CREATE

Create a craft

Create a craft project related to jellyfish. You can make a model jellyfish out of paper or clay, or create a painting or drawing of a jellyfish.

WHY THIS DAY MATTERS

Why We Love Jellyfish Day

Jellyfish help protect our environment

The presence of jellyfish helps maintain healthy marine ecosystems by preventing algal blooms, competing with fish species for food sources and providing a source of food for some larger carnivores. Without jellyfish, many marine habitats would be at risk of degradation due to overabundance of certain fish species.

Jellyfish are beautiful

Jellyfish are delicate and elegant creatures with their graceful movements and mesmerizing translucence. Watching them swim is like being taken away to an otherworldly place - truly an amazing sight to behold!

Jellyfish have unique abilities

Did you know that jellyfish can actually change their color if they're stressed or scared? They also have specialized muscles which allow them to move quickly and rapidly contract to propel themselves forward in the water. These resilient animals are incredible survivors, having been around for millions of years!