The moon jellyfish is one of the most widespread and recognizable cnidarians on the planet, drifting through every ocean from the tropics to subarctic seas. Despite lacking a brain, heart, or bones, it is a remarkably effective predator that ensnares zooplankton with thousands of tiny stinging cells. Its translucent bell pulsates rhythmically to provide gentle locomotion, though it largely travels at the mercy of ocean currents.
About the Jellyfish
Aurelia aurita
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💡 Fun Facts
01
Jellyfish are older than dinosaurs — fossil evidence shows they have existed largely unchanged for over 500 million years.
02
The moon jellyfish body is approximately 95% water, making it nearly invisible in clear ocean water.
03
Some jellyfish species are biologically immortal — Turritopsis dohrnii can revert to its juvenile polyp stage after reaching adulthood.
04
Jellyfish have no brain, heart, or blood, yet can sense light, gravity, and chemical signals with a simple nerve net.
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During blooms, a single square kilometer of ocean can contain over 100,000 moon jellyfish, enough to clog power plant cooling systems.
📍 Where to Find This Animal
Habitat Types:
Open Ocean
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