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Homescience

From being immortal to having no brain: 10 mind-blowing facts about Jellyfish

Dive into the mysterious world of jellyfish. These ancient, brainless and nearly immortal creatures continue to amaze scientists across the globe.

Gurpreet Singh | November 04, 2025 / 16:01 IST
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1. No Brain, No Heart: Jellyfish lack brains, hearts, and bones, yet their nerve nets coordinate movement, hunting and environmental sensing efficiently. (Image: Canva)
1. No Brain, No Heart: Jellyfish lack brains, hearts, and bones, yet their nerve nets coordinate movement, hunting and environmental sensing efficiently. (Image: Canva)
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2. Older Than Dinosaurs: Jellyfish have swum Earth’s oceans for over 500 million years, long before dinosaurs or even trees appeared. (Image: Canva)
2. Older Than Dinosaurs: Jellyfish have swum Earth’s oceans for over 500 million years, long before dinosaurs or even trees appeared. (Image: Canva)
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3. Glow in the Dark: Many jellyfish species are bioluminescent, producing blue or green light to communicate, hunt, or deter predators underwater. (Image: Canva)
3. Glow in the Dark: Many jellyfish species are bioluminescent, producing blue or green light to communicate, hunt, or deter predators underwater. (Image: Canva)
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4. Made Mostly of Water: Jellyfish bodies contain nearly 95% water, making them delicate, translucent, and vulnerable outside their natural ocean habitats. (Image: Canva)
4. Made Mostly of Water: Jellyfish bodies contain nearly 95% water, making them delicate, translucent, and vulnerable outside their natural ocean habitats. (Image: Canva)
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5. Can Clone Themselves: When cut in half, some jellyfish can regenerate into two complete organisms, effectively cloning themselves through cellular regeneration. (Image: Canva)
5. Can Clone Themselves: When cut in half, some jellyfish can regenerate into two complete organisms, effectively cloning themselves through cellular regeneration. (Image: Canva)
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6. Deadlier than Sharks: The box jellyfish delivers venom so potent it can kill humans within minutes, making them one of the ocean’s deadliest stingers. (Image: Canva)
6. Deadlier than Sharks: The box jellyfish delivers venom so potent it can kill humans within minutes, making them one of the ocean’s deadliest stingers. (Image: Canva)
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7. Can Detect Ocean Currents: Despite lacking brains, jellyfish sense light, gravity and currents, allowing precise navigation through vast and changing ocean environments. (Image: Canva)
7. Can Detect Ocean Currents: Despite lacking brains, jellyfish sense light, gravity and currents, allowing precise navigation through vast and changing ocean environments. (Image: Canva)
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8. Influence Ocean Ecosystem: Jellyfish blooms can shape marine food chains, sometimes disrupting fisheries and oxygen levels by consuming large quantities of plankton. (Image: Canva)
8. Influence Ocean Ecosystem: Jellyfish blooms can shape marine food chains, sometimes disrupting fisheries and oxygen levels by consuming large quantities of plankton. (Image: Canva)
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9. Can Shrink When Starved: When food is scarce, jellyfish reduce their size yet retain energy, resuming growth once conditions are improved. This is an amazing survival trait. (Image: Canva)
9. Can Shrink When Starved: When food is scarce, jellyfish reduce their size yet retain energy, resuming growth once conditions are improved. This is an amazing survival trait. (Image: Canva)
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10. Can live Forever: The Turritopsis dohrnii, known as the “immortal jellyfish,” can revert to its youthful stage, escaping death repeatedly. (Image: Canva)
10. Can live Forever: The Turritopsis dohrnii, known as the “immortal jellyfish,” can revert to its youthful stage, escaping death repeatedly. (Image: Canva)

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