World Jellyfish Day 3 Nov 2025

World Jellyfish Day

They don"t have brains, bones or even hearts, yet jellyfish have pulsed through Earth"s oceans for half a billion years. Today, on World Jellyfish Day, these wobbly wonders get their moment in the sun—or at least under the sea. The day promotes efforts to protect jellyfish habitats from threats like pollution, nutrient-rich runoff and ocean acidification.

© Christian Vizl/TANDEM Stills + Motion

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Today in History

Living in harmony
3 Nov 2023World Jellyfish Day
3 Nov 2024International Day for Biosphere Reserves

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13 Mar 2026Church of Notre Dame de Bon-Port, Les Sables-dOlonne, France
9 Sep 2024Iguazu Falls at the border of Argentina and Brazil
26 Oct 2023Stormont Estate, Northern Ireland
29 Aug 2025Aerial view of Plaza Mayor, Madrid, Spain
25 Jul 2024Great Smoky Mountains National Park, Tennessee, USA
4 Aug 2024San Gimignano, Siena, Italy
16 Apr 2024Union Square, Manhattan, New York, USA
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27 Nov 2025Eastbourne Pier, East Sussex, England
8 Feb 2024Mount Hood, Oregon, USA
1 Nov 2023Haut-Barr Castle
19 Oct 2024International Archaeology Day
7 May 2024A duckling swimming in a water meadow, Suffolk, England
26 Dec 2025Boxing Day
8 May 2026World Donkey Day
An island park
23 Jan 2026Þorrablót, Icelandic midwinter festival
16 May 2024International Day of Light
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17 Jun 2024Green-crowned brilliant hummingbird
From victory to festivity
10 Jul 2025Independence Day of the Bahamas
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12 Dec 2023Reed bunting
A glowing square of squares
15 Dec 2025Spiegelgracht canal in Amsterdam, Netherlands
13 Apr 2026International Dark Sky Week